By the time my grandson is grown up, they _______ ...

★ Future Tense

By the time my grandson is grown up, they _______ all the trees in the local forest.

A. will have cut down

B. will cut down

C. are going to cut down

D. will be cutting down

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If you come at seven tomorrow, I _______ in my garden.

A. will work

B. will be work

C. will be working

D. will working