根据句意，用所给动词的适当形式填空。(非谓语动词专项练习)
1. Is it necessary ____________(learn) a foreign language?
2. He is good at _____________(swim).
3. Do you have anything ____________(say) for yourself?
4. It’s spring now. It’s time _____________(plant) trees.
5. Don’t keep me _______(wait) for a long time.
6. The policeman told the boys not ____________(play) in the street.
7. Her son is too young __________(dress) himself.
8. The ice _________(cover) with snow is dangerous to walk on.
9. China doesn’t want ___________(copy) the USA’s example.
10. Let’s __________(have) a rest, shall we?
11. The speaker spoke too quickly for us ____________(understand).
12. The book seems easy __________(read).
13. I asked him __________(show) me his new pen.
14. A __________(break) car is parked at the corner of the road.
15. Knives are used for ______________(cut) things.
16. What’s his _____________(give) name, do you know?
17. I really don’t know what __________(do) next.
18. I often hear people _________(say) “________(see) is ______(believe)”.
19. You’d better _________(try) this medicine.
20. They said they had nothing _________(worry) about.
21. Can you finish ___________(read) the book in three days?
22. I have been busy all these days. I really want __________(relax) myself
