在橫線(xiàn)上填上適當(dāng)?shù)闹?情態(tài)動(dòng)詞。
1. —Must I finish the work now?
    —No, you _____.
2. —Can you speak French?
    —No, I _____.
3. —Do I need to call Mr. Black?
    —Yes, you _____.
4. —May I open the door now?
    —No, you _____. It's too noisy outside.
5. -May I go now?
    —Yes. You _____.
1. needn't   2. can't   3. do   4. mustn't   5. can / may
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