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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Complete the sentences with the correct form of the modals and verbs in parentheses:

We ___________ (need / advertise) more. No one knows our products.

A. needs to advertise

B. need to advertises

C. need to advertise