用must,must not,can或can not填空
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1.“（Must ）I come at 6 o’clock?”“Oh no,you needn’t."

2.A blind man （can't）judge colours.

3."May I go there?'' “No,You (needn't )"

4.Two eyes ( can ) see more than one.

5.I （must）be off.Thank you very much for supper.

6.You (must )be careful.You ( )be careless.

7.(can )I stay up till midnight,please?

8.The teacher (can't )favour som children more than others

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