1. You mustn't believe everything you read in the newspaper
2. It's raining . You must take an umbrella
3. Excuse me , but may I ask ...?
4. You mustn't be blind...
5. Listen , I may be late this evening ...
6. If you see Huong , should you...
7.Before the plane lands , the ''no smoking'' sign should come ..
8. you must stop smoking
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