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I. Choose the correct answer.

1. You ______ never do that again!

A. need B. must C. should

2. They can go home, they ______ stay any longer.

A. needn't B. mustn't C. shouldn't

3. Children ______ know the traffic rules.

A. should B. must C. need

4. You are in a hospital. You ______ be quiet.

A. must B. need C. should

5. Our teacher says that we ______ do any homework today.

A. mustn't B. should C. needn't

6. If you have problems with your health, you ______ eat a diet.

A. must B. need C. should

7. You ______ say any more. I agree.

A. mustn't B. shouldn't C. needn't

8. They ______ worry. She can do everything herself.

A. needn't B. mustn't C. shouldn't

9. Do you hear the command? You ______ be quiet!

A. must B. need C. should

10. The pie is very tasty. We ______ try a piece.

A. need B. must C. should