Complete the sentences with the correct form of the modals ...

★ Expressing Obligation and Modals

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

Companies ___________ (must / promise) customers products they cannot build.

A. must promise

B. mustn’t promise

C. musts not promise

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We ….. collect our project by tomorrow to get A in Biology.

A. Must

B. Shouldn’t

C. Mustn’t

D. Can