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If our teacher _______ here tomorrow, I will call you at once.

A. will come

B. is coming

C. comes

D. is going to come

If our teacher ________ here tomorrow, I will call you at once.

[　　]

If he ________ back next month, I'll tell him the news.

[　　]

If he ________ back next month, I'll tell him the news.

[　　]