[ Modal Verbs ]
The book is optional. My professor said we could read it if we needed extra credit. But we_______________ read it if we don’t want to.
A. don’t have to
B. must not
C. cannot
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The company ______ English as the official language three years ago.
A. adopted
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A. watching
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He said he _______ return later.
A. will
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D. would be