A good sense of humour is important, even in business. ...

★ Expressing Obligation and Modals

A good sense of humour is important, even in business. You ____________ serious all the time.

A. don’t got to be

B. don’t have to be

C. mustn’t be

D. don’t not have to be

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“The test is five minutes left. We… finish it soon.” The best answer to complete the sentence is…

A. shouldn’t

B. should

C. have to

D. musn’t