Topics: 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
Preview next quiz:
“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