When Polly left home that morning, the city was already covered in grey mist. After work, Polly tried     1     (take) her usual bus home before the fog got too thick, but the bus conductor told her to take the Underground to Green Park and find a taxi there. On the train, as Polly observed the passengers, she had a feeling that she was being watched by a tall man     2     wore a dark overcoat. While the rest of the passengers were getting out, she glanced     3     the faces around her. The tall man was nowhere to be     4    (see). When Polly got to the station entrance, it was empty. The fog lay like a thick grey cloud. There was no one in sight.     5    (sudden), Polly heard the sound of     6     (footstep), her heart     7     (beat) with fear, but she decided to accept his help. The man took Polly’s hand and led her to her house. In his other hand the man carried     8     stick. What a surprise when the man told Polly he was blind! She wanted to invite him to her home to rest for a while, but the man left quickly. He wanted to pay back the help that people gave     9    (he) when it was     10     (sun).

It’s common that there are     1    (heat) arguments and cold silences between teenagers and their parents.

Teenagers’ physical changes may result     2     such family tensions. Parents may become teenagers’ first targets of their anger because they may feel     3    (anxiety) when developing at a different rate to their friends, shooting up in     4    (high) or getting left far behind, and they might worry about their changing voice, weight problems or spots.

It is also difficult to balance their developing mental needs. They enter a strange middle ground — no longer a small child but not quite     5     adult, having both a new desire for independence and a continued need for their parents’ love and support. They feel ready to be more responsible and make decisions on     6    (they) own.     7    (Unfortunate), their parents do not always agree. So they need struggle     8    (control) their feelings, while at the same time they wish their parents could be more caring and patient. However, their parents treat them like a child     9     expect them to act like an adult. All of this can lead to a breakdown in their relationship.

Anyhow, teenagers need to improve the situation. The key to     10    (keep) peace is regular and honest communication.

When I was a young girl, my parents tried their best to make ends meet. My father was a teacher, and my mom     1     (stay) at home to take care of me and my new baby brother. What was more, my mom also took care of two foster (收养的) children, a 12-year-old and a 4-year-old, because no one else had room for them in the area.

That Christmas, my parents faced     2     difficult choice. My dad told my mom that he could either pay the rent     3     give us all Christmas presents.     4     (nature) they decided that rent was more important. They could not even buy a tree.     5     (make) us all happy on Christmas Eve, my mom suggested that we drive into Rochester to look at the city     6     (decorate) by beautiful festival lights, and we all agreed.

On our way there, my dad noticed a huge stand of Christmas trees by the side of the road, and a large sign on the biggest tree. The sign read: “MERRY CHRISTMAS! If you haven’t got your tree yet, please help     7     (you) to one of these. No need to leave any money-just have a     8     (wonder) holiday!”

I didn’t understand at that moment     9     my dad started to cry, but I know now. I think it was the     10     (good) Christmas we ever had.

Bees live in a well-organized society. They have a highly developed language     1     is different from those of other animals. They     2     (normal) pass important messages to each other about where     3     (find) food.

A searcher bee goes out looking     4     new food supplies. She returns home and     5    (give) her information to the worker bees there. The major way that bees communicate is by touch.This is how bees can tell which kind of flower the searcher bee has found. She then does     6    dance to give more information to the worker bees.

There are two     7     (type) of dance that tell about food: the “waggle” dance and the “circle” dance. The searcher bee does the circle dance when the food supply     8     (be) close to the home.In the dance, she moves in small circles to tell the worker bees that food is very near. However,the dance does not give     9     (they) any directions. It is     10     (amaze)that the clever bees still know where they can find the food.

Bike-sharing is popular in China, with an increasing number of people choosing bike riding instead of     1     (drive). The bike often has GPS or Bluetooth on it, and can be unlocked with a smart phone and left anywhere in public. Bike-sharing allows people     2     (borrow) a bike from one place and return it at another place.

    3     is very convenient to use the sharing-bikes if you have a smart phone. First, you have to download an APP onto your smart phone. Then what you need to do is to find the nearest bike. Scan the QR code (二维码) on the bike with your phone in order to make a Bluetooth     4     (connect). You will find the bike will have unlocked     5     (it). Then you can enjoy your trip. The greatest advantage of bike-sharing is that you can     6     (easy) find one and never worry about where to park it. The cost of riding depends on the time     7     is spent on your trip. Generally, it doesn’t cost too much.

So far, technology and science     8     (change) our lifestyles greatly. We have to say bike-sharing brings us     9     (much) convenience than before. And we also hope that people can not only enjoy it 61.    10     put it to good use.