Ex 1. Điền mustn’t hoặc don’t have to
1. There’s a “No right turn”. You ___ turn right.
2. The signs “No smoking”. You ___ smoke here.
3. You ___ have an appointments for this doctor. You can go and see him when you want.
4. You ___ hurry. We have plenty of time.
5. The big boss will be at the meeting. You ___ be late.
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