The supermarket provides customers _____ plastic bags for free.

A.on                             B.with                         C.of                              D.in

—Could you tell me _____?

—Sorry, I don’t know.

A.where are my socks                                           B.where can I find my socks

C.where my socks are                                           D.where my socks put

It’s necessary for you _____ exercise every day.

A.taking                               B.to take                    C.take                                  D.takes

—_____ you _____ your homework yet?

—Yes, I _____ it ten minutes ago.

A. Did ; do; finished                                      B. Have; done; have finished

C. Have; done; finished                                         D. Will; do; finish

In our class _____ of the students _____boys.

A.third fifths; is                  B.third fifth; are       C.three fifth; is                  D.three fifths; are

Our teacher told us that light _____ much faster than sound.

A.traveled                           B.travels                    C.is traveling                      D.was traveling

—Is the bag beautiful?

—Yes, at _____ it’s _____ the one you bought for me.

A.last; as bad as                                                              B.least; no better than

C.last; not better                                                             D.least; no worse than

I can’t stand _____ for you so long.

A.to wait                             B.waiting                   C.waits                       D.waited

_____ the environment is important for human beings.

A.Take care of           B.Taking care of        C.Took care of           D.Take the care of

I can’t remember when I started collecting litter. But it was when I got tired of   46   litter nearby that I realized no one else was going to pick it up.

I live near a forest in Ohio, America. I can walk there   47   three minutes. I used to love going there to play with my dog. But one day there was   48   much litter there that I became very unhappy. I decided to clean up the forest, and I wanted to   49   happy when I went again. I made my first trip to clean the forest that afternoon. I took a big black rubbish bag with me. Ten minutes   50   I started to pick up litter, my bag was full! There were cans, bottles, broken glass and newspapers in it.

From then on, I  51  to the forest four times a year to pick up litter. I often stay there for three hours. It makes me feel   52   to do something for the environment. After each trip, I look through all the litter that I’ve collected. If   53   of it is recyclable（可回收利用的）, I’ll keep it. I can’t understand why people drop litter. But I will keep on picking it up   54   they stop dropping it.. I know I am only doing a small bit   55   the earth, but I still think it is important.

1.A.seeing                           B.throwing                          C.dropping                         

2.A.after                    B.for                                     C.in

3.A.such                     B.very                                   C.so                                     

4.A.make                   B.feel                                    C.look                                  

5.A.after                    B.later                                  C.before                             

6.A.had gone            B.have gone                       C.go                            

7.A.tired                     B.sad                                    C.great

8.A.many                   B.few                                    C.any                

9.A.until                     B.after                                 C.as soon as                      

10.A.helped                        B.to help                              C.help