Choose correct answer. 1. Late-comers are to report to the main office. It's a good idea/It's the rule.
A. It's not a good idea
B. It's the rule.
C. should
D. It isn't allowed

2. You really ... start spending more time on your work.
A. Must
B. Have to
C. Should
D. Cannot

3. You'd better leave now. That's my advice/That's an order!
A. don't have to
B. It's the rule.
C. That's my advice
D. It isn't allowed​

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