1 . When I was a practice teacher in a middle school，the students in my class were always making ______，and had no interest in chemistry. So I decided to do ______to change their______ towards chemistry.

The evening before I would teach all by myself，I gave a piece of paper to everyone. I told them to write ______ they wanted on the paper and handed it in and then I could tell what each one had ______ .All the students said I _____ be longsighted(远视)．Then I stood ______ my back towards them. I didn't turn back ______ they had finished and ______ all the paper in a cardboard case.

I turned the cardboard case with the bottom(底部)towards the students，and told them calmly what each one had written on the paper. The students were surprised，______ that I had learned their ______ completely in such a short time.

I told them the truth and they were ______ at my brightness：there were five lines of students in the classroom，and every line had ten students. I had written serial number(from 1 to 50 )on every ______ of the paper in a chemical reagent(试剂)that cannot be seen ______eyes，and then gave ______out to the students according to the groups of their seats. After the paper was ______ in，I used______ chemical reagent onto the corner of the paper. Thus the serial number was ______！

______ ，the students became ______ interested in chemistry，and we became good friends.

3 . Over the last few weeks, I have been back and forth to the hospital and working with my doctors and medical technicians. I feel very _________ and appreciative of all the great minds and effort involved in _________ my illness. I found I have become _________ grateful to those human beings who invented the many medical _________ that have saved so many lives and _________ so much pain.

With everything I _________, I couldn’t help thinking about many life-changing _________ that we humans have come up with, from the fairly simple stethoscope (听诊器) to more _________ inventions like X-rays, and other great devices. Of course, one of the biggest, most basic inventions was the _________. It changed the world in all kinds of ways. Without wheels, we’d have no __________, such as bikes, cars, trains, or airplanes.

__________many inventions human beings have invented through the ages, I __________ some very popular inventions. It is __________ to imagine what if we live without them. These __________ things like tape, nails, Post-it notes, DNA testing, the Internet, vaccines, and medical imaging.

Some inventions were accidental __________ but many were matter of simply trying to solve a problem. If we pay attention to what we experience and really put our __________ to it, there is no reason why we couldn’t come up with some new inventions ourselves. Maybe make a list of __________ items, systems, and habits we all have, and then go up and down the list and see if we can put two or three items together in a way to come up with a new __________ or better way to handle life and the __________ in it. Give it a try and see what we can come up with, We could __________ ourselves, and others as well!

4 . My brother Joe liked driving cars. He was especially _________speed. It was enough to make mother _________.

As a little boy, Joe would often say to me. “Sister, when I am old enough to drive my own car, I will fly so fast that angels will run scared.” With a big grin (咧嘴笑), he would _________ the scene. I could have told him it would _________ happen. But I didn’t tell him that.

Joe was born blind. But he could _________ like anyone. I didn’t want to be the one to _________ Joe’s dreams._________ would do that for him, soon enough. Up to then, didn’t he _________ his happiness？

Growing up is a _________ between disappointment and surprise, between dreams and reality. When Joe was 12, I think he knew he would never get a license (驾照). As with the other hard facts of life, he seemed to accept it without question or sadness, as if it were __________ more than a card drawn at random (随机地).

One hot summer day when he was 16, Joe, with the help of stick, found his way to my stepfather’s car.

He felt the heat of the __________, opened the door and climbed in. Under the seat, he discovered 6 cans of beer. And he drank all. He found the keys, shouted, “Hooweeee!” and __________ it up.

I have heard various versions (版本) of this story. They all __________ this: the car’s engine __________. My mother fainted. My stepfather rushed outside.

__________, for everyone, the Ford didn’t move an inch. But to this day, Joe still swears (发誓) that when he found those keys and fired that old engine up, he heard the angels.

5 . As is known to all, positive people are lucky people. They can see the roses _________ others see only the thorns (刺). They _________ bring more luck to themselves. Positive people through adversity (逆境) still see the _________ and consider themselves fortunate.

I met a man who couldn’t move from the neck down in Cape Town. He said since his accident, he _________ he was lucky to have found the kind of peace although only his head could move. He painted the most beautiful pictures with brushes in his _________ and held talks on personal development. He considered he had _________ more and helped more people than before. He said he was now truly _________ . Seeing his positive thinking, I was greatly amazed. Instead of complaining, he found something good in his situation and _________ it.

There is an old _________ that goes something like “I had no shoes so I had the blues, until I walked the streets and met the man who had no __________ .” We should always count our blessings and be __________ for what we have.

If you believe you are lucky, you will be lucky with that positive mindset. Things in the world just __________ , and it’s how we view it that decides our standpoint. The __________ event can be lucky or unlucky depending on your perceptions. Do positive people think everything will just come to them without action or any effort on their parts? No. It’s just a way of getting the best out of any result with an optimistic mind __________ a black cloud following us everywhere. Positive thinkers learn from their mistakes and put __________ behind them with the strength and fortitude to continue.

7 . The Healing Power of Sad Songs

Feeling down after a breakup or loss？Slide on your headphones and turn up some sad tunes. Experts say listening to sad songs can help to heal your broken heart. It's no surprise that some of the biggest songs of 2019 were about heartbreak. No post-breakup playlist seemed _________ without Lewis Capaldi's "Someone You Loved." And we can't forget Selena Gomez's "Lose You to Love Me." Yes，almost everybody loves a good breakup song. But what is it exactly about these sad songs that makes us grab a box of _________ and hit repeat, especially when we're already feeling down？

While there's plenty of advice out there about how to move on from a difficult breakup or any other kind of loss, playing sad songs may seem like an unlikely _________. But there's something about listening to blue music that eases heartache. In fact, it s been scientifically proven that music itself can have _________ effects.

In one study, participants submerged their hands in ice-cold water. One group listened to their favorite music during the experiment, while another group listened to music chosen for them, and another group sat _________ . The results？Those who listened to their preferred music were able to cope with the pain for a longer amount of time. In another study, functional MRI(磁共振成像)scans of people listening to songs they enjoyed _________ increases in dopamine, one of the chemical messengers in our brains responsible for pleasure.

Researchers say there are four cognitive benefits to what they call "music-evoked sadness." The first is the _________ . Music allows people to daydream and remember happier times in their lives or relationships. The second advantage is emotional regulation. That is，it’s much healthier to express anger and frustration by shouting along with Lizzo or crying along with Sam Smith than it is to _________ your feelings up inside or take them out on someone else. The third benefit is empathy or the emotion that allows people to _________ to one another. While breakups inevitably result in feelings of loneliness，sad songs are a reminder that they can happen to anyone--yes，even Taylor Swift！Heartache is __________ , and music helps to reassure us that we're all going through it together. Lastly, sad music benefits listeners __________ there are no real-life consequences of letting your thoughts and imagination run away with a song. While the song plays, listeners can grieve and process their feelings.

Experts note, however, that it's essential to keep in mind that listening to only sad music for an extended time period can actually begin to __________ these benefits. A person might be lost in grief when it's time to move on. __________ , there are plenty of breakup songs that act as uplifting songs of independence, too. And listening to happy tunes can help people feel more cheerful over time. So when the pain starts to ease up a little --and it will-- try __________ that sad song playlist and turning up the tempo(乐曲速度)instead.

Researchers know that ultimately, breakups and other kinds of heartbreak only make us stronger. Sad songs serve as a __________ for feeling our emotions instead of avoiding them, allowing us to process the memories (both painful and joyful)and move forward to the next chapter of our lives, whatever that may hold.

8 . Before I was born, my mom had worked as a nurse. However, she resigned (辞职) shortly after my birth to ________ me. After I turned 12, she ________ to work.

She left at 5:45 am, which left me ________ for waking myself up, preparing breakfast and walking to take the 7:30 am bus. I ________ being left home alone in the mornings. On days when she didn't go to the ________, she drove me both ways. Those were the ________ days.

One day, as we walked down the sidewalk, I saw an elderly man ________ us. He broke into a wide smile, but I didn't ________ him. “Leigh! Leigh!” he called my mother's name. I looked at him and smiled, unsure of my role.

“I hope you know how ________ you are!” he said after some small talk with Mom. I looked at him ________ since I had no idea what he was talking about.

“You have the most wonderful, ________ and lovely mother,” he said. “When I was in hospital last month, she took good care of me. Actually, young lady, I shall never ________ her.” Right then, I ________ what it meant for my mom to be a ________. She was caring for, serving and loving total ________, often during the darkest times in their lives. She cared for them and me, too.