7）I saw some fallen leaves ______(漂浮) in the river.

8）His parents were ________ (吃惊的) at what he said.

9）It's important for us to keep the ________ (平衡) of nature.

10）When you heat a metal ,it ______(膨胀).

Ⅳ单项选择

1. I am proud ________what I have done.

A. for B. in C. of D. to

2. There are only ________natural resources as there were thirty years ago.

A. as half much B. as half many C. half so much D. half as many

3. Her hair's the same colour ________.

A. of her mother B. as her mother C. with her mother's D. as her mother's

4. Would you please put these sentences ________? They are jumbled now.

A. in the order B. in order C. to the order D. to order

5. Medical experts of China are devoted to ________the ________of SARS and ways

of dealing with it.

A. finding out; cause B. find out; cause C. finding out; reason D. find out; reason

6. ________you forget it, ________you'll suffer from it.

A. Sooner; less B. The earlier; less C. The earlier; the less D. The sooner; the less

7. The Great Wall has been ________several times. The repair work is done every year.

A. added B. adding to C. added to D. added in

8. You can't, imagine that rats eat 40 to 50 times ________.

A. in weight B. by weight C. of weight D. their weight

9. Mr Smith is ________a teacher. He is also our good friend.

A. only B. more than C. no more than D. nor more than

10. This is the ________model, which has just been developed.

A. late B. latest C. later D. lately

11. We don't do it in this way now, but it ________in this way.

A. used to do B. used to be done C. was used to be done D. was used to doing

12. He ________to come at eight, but in fact he never comes before nine.

A. is supposing B. supposes C. is supposed D. supposed

13. Look! The ________leaf is floating just like a little plane.

A. falling B. growing C. grown D. fallen

14. ________of the forest is covered with trees of broad leaves, while the rest pine trees.

A. Three quarters; is B. Three quarters; are C. Three fourths; are D. Three fourth; is

15 With a lot of difficult problems ____, the _____ president is having a hard time.

　　A. settling; newly-elected B. to settle; newly-elected

　　C .settled; newly-elected D. to settle; new-elected

16 Canadian researchers have shown that the shorter the index finger is , ____ the ring finger,____ aggressive men are likely to be.

A. compared with; more B. comparing to; the much