16. He ____________ telephone her right now if he knew her phone number.

A. would                 B. have to                 C. will                         D. shall

17. Your father works in a central hospital, ____________ he?

A. isn’t                 B. didn’t                 C. wasn’t                 D. doesn’t

18. Scientists still ____________ a cure for Covid-19.

A. doesn’t find                B. hasn’t found        C. haven’t found         D. aren’t finding

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