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Ответ:

1) could

2) must

3) Birds can fly but lions can't.

4) may I help you?

5) I must wear

6) You can't smoke

7) Could you

8) I must

9) You can't be late for school.

10) You should do

1.couldn't 2.needn't 3.can, can't 4.can 5.must 6.mustn't 7.could 8.must 9.may 10.must 11.can 12.had to, needn't 13.shall 14.can't 15.could 16.must