100%正确！

1、reading

2、fun

3、improve

4、think

5、A

6、B

7、C

8、C

9、A

10、D

11、I'm thinking about what I'm going to say.（改为同义句）

=I'm thinking about what (to say).

12、你为什么不每天晚饭后外出散步呢？

(Why don't) you (go out) for a walk after supper every day?

13、He's been to Tokyo Disneyland .

=He'been to Tokyo Disneyland, (hasn't he)?（改为反意疑问句）

14、He (fell) down from the tree and hurt his leg.

15、Don't you hear someone (crying) in the next room?

16、He became a vet after he (grew) up.

17、We often go (boating) on the lake.

18、The children looked at the (noisy) machine.

19、C

20、(楼主打错字了)正确答案为：you will have, rains

21、C

22、B