I still remember the park        we first met.

—We don’t have much homework this  we go out together?

—OK. What about        a movie?

 It doesn’t look like rain, so you        bring your umbrella with you.

The teacher told the students        any food into the computer room.

—Why don’t you like winter in Beijing?

—Because it is        winter in Guangzhou.

You should really        smoking. It’s a terrible habit.

 The teacher speaks very loudly        all the students can hear her.

 If you get on well        your classmates, you’ll enjoy your school life more.

—Have you brought        with you? We won’t have time to come back.

—Don’t worry. All the things we need are here, in this big bag.

In the 13th century, Marco Polo travelled a long way to China. He was a famous Italian 31 During his stay in China, he saw many wonderful things. One of the things he 32 was that the Chinese used paper money. People in 33 coun­tries didn't use paper money until the 17th century. However,people in China began to use paper money in the 10th century. 34     was invented by a Chinese about 2 000 years ago. His name was Cai Lun. He then 35 these pieces of paper together and made them into a 36 .

Now paper mainly comes from trees. We use it every day. 37 we waste a lot of it. If we keep on doing so, people 38 cut down many more trees. Then there will not be any trees left. If there are no 39 , there will be no paper.

So how can we 40 paper? When we mak­ing notes,we can use 41 sides of each piece of paper. We  can  buy  drinks  in bottles instead of 42  in paper packets. We can also use cotton handkerchiefs ( 棉手帕) and not the paper ones.

43  we go shopping, we can use fewer paper bags. If the salesman gives us a paper bag, we can keep it and 44  it later. We can help to protect trees if we think 45 . We should to it now,before it is too late.

9. A. books         B. trees          C, leaves        D. factories