2 . 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.

6 . Accents are an important part of our identity. An accent gives clues about who we are, and the community we belong to or wish to belong to.     1    

What is the difference between accents and pronunciation?

Accents are about localized ways of speaking a language. A French person may speak English flawlessly (完美无瑕地), just with a French accent.     2     However, pronunciation is something that — as a learner— you can get right or wrong. If your pronunciation is correct, you can communicate effectively with others whatever your accent is.

    3    

If you think back historically people were much more localized with generation after generation of families living in the same small villages and few people traveled out of that area during their lifetimes. So over many generations differences in accent emerged and became very distinct to particular areas. Mountainous villages that are not easily accessible often develop very strong and distinctive accents.

How important is it to get an accent right?

If you’re moving to a certain part of a country, you might want to integrate better with your new community.     4     That’s because it shows a sense of belonging to the community you are trying to fit in with.

How to improve your accent?

    5     And then learners should consider which sounds exist in the language you’re learning and then spend some time in front of the mirror practicing moving your tongue and mouth to get those new and different sounds. And learners should be aware of stress and tone, which can sometimes even change the meaning of words.

9 . Many orb weaver spiders have yellowish stripes or spots on their undersides for a good reason. That color yellow attracts bees and flies into a spider’s web, a new study suggests.

Orb weaver spiders get their name because they spin and sit on circular webs. But these spiders and their bright colors seem contradictory. Why would a spider look so noticeable? In the new study, researchers examined if yellow coloration on a species of golden orb weaver spiders (Nephila pilipes) attracts their flying insect prey. Found across Asia, this spider sits on its web day and night with its underside facing open space. The team found more than 250 female N. pilipes in the wild. They removed each female and either left its web empty or replaced it with a cardboard spider. These cardboard models had paper stripes of yellow, blue or black color stuck to them.

After almost 1,800 hours of video recording the webs, the team found that during the daytime, the yellow-striped model that looked like a real N. pilipes attracted more than twice as many insects, including bees and flies as any other fake spider or empty web. What's more, the yellow color worked just as well at night attracting moths, the scientists reported.

The team then searched online zoological databases for associations between yellow markings and prey attraction in orb weaver spiders. Surveying dozens of distantly related species showed that yellow stripes or spots were more likely to have evolved in orb weaver spiders that sit on their webs in open, bright spaces, where visual baits may be more effective.

Scientists don’t yet know why insects are attracted to yellow stripes on orb weaver spiders. Perhaps the prey mistake a spider for a yellow-flecked flower, a hypothesis (假说) supported by the fact that most prey attracted were pollinators (传粉者).

10 . As my family and I drive to my grandmother's house, my dad points out all the houses he lived in as a_________. I count 12, probably _________ one or two along the way.

At 16, my dad had to_________ high school to support his mom and six siblings. He tells my brothers and me stories of when he was our _________.One time, he came home from school to find a(n)_________ house and a notice that his family would be removed from the property. But he says it like it was _________. We start to understand why he has no _________of his younger self. His dad spent all his money on gambling and alcohol.

There is no anger in my dad's tone. _________, there is a sense of longing as he _________the few times he and his dad would sit together and watch football. His little sister would ____________at birthday parties because she could never have one of her own at home. We ____________my dad his first birthday party when he was at least 40.Forty birthdays before his first party. My brothers and I have had one every single year.

He tells us to make a(n) ____________to work hard and stay in school. We've heard it so much that sometimes we ____________our eyes. But his words now ____________in my head, and I find new ____________every time I recall them: “There's nothing you can't do if you stay in school and work hard.” I wonder how different my father's life could have ____________if he'd had just one person saying those words to him.

My dad works 16 hours a day. He's gone before I'm ____________and home just as I'm falling asleep. He works hard so we can have a good home and do the things he never could. It makes me think the world is at my ____________and nothing is impossible. For 18 years, my dad has always told me this, but now it's my ____________: I am so ____________of you, Dad.