1．He'll do his best ______ （learn）a foreign language well．

2．She isn't old enough ______ （join）the army．

3．It's time for us ______ （go）to school．

4．I'm sorry ______ （hear）that．

5．The runner fell and hurt his left leg but he quickly got up and went on ______ （run）．

6．How about ______ （skate）this afternoon？

7．What about the ______ （sleep）pills I gave you？．

8．Are you good at ______ （swim）？

9．We are all interested in ______ （play）games．

10．He gave Mrs Beet mouth-to-mouth   ______ （breathe）．

11．He spent 30 yuan ______ （buy）that dictionary ．

12．It took me half an hour ______ （finish）that work．

13．It's best ______ （wear）warm clothes in winter．

14．Let's do the ______ （shop），shall we？

15．Are you enjoying ______ （live）on the fifth floor？

16．It's very important ______ （learn）English well．

17．After he finished ______ （write），he had a good rest．

18．Do you know what ______ （do）next？

19．He decides ______ （help）us．

20．She asked me ______ （say）it in English．

21．Would you like ______ （go）to the Great Wall？

22．He wanted me ______ （see）a film with him this evening ．

23．I have something ______ （do）．

24．He found it very important ______ （use）computers．

25．He is too young ______ （go）to school．

26．It's very nice of you ______ （help）me．

27．I'm very，very glad ______ （see）you．

28．Shall we go ______ （boat）？

29．What are you doing in the ______ （read）room ？

30．There was no time ______ （think）．

答案:

1．to learn 2．to join 3．to go 4．to hear 

5．running 6．skating 7．sleeping   8．swimming   

9．playing 10．breathing 11．buying 12．to finish 

13．to wear 14．shopping 15．living 16．to learn 

17．writing 18．to do 19．to help 20．to say 

 21．to go 22．to see 23．to do 24．to use 

 25．to go 26．to help 27．to see 28．boating 

 29．reading 30．to think

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