I don’t know _____ or not he will come . ______

I don’t know _____ or not he will come . _______ he comes , I will call you .

#55872

whether ; If

whether ; Whether

if ; If

if ; Whether

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People cut down too many trees, _____ the greenhouse effect becomes more and more serious.

#56516

because

although

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nor

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and

Bill can swim, _______ he can’t sing.

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—How about joining us in the summer camp? —I wish I could, ___________ I have to practice for the piano test.

#56543

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---You look very healthy. ________do you exercise? -----I exercise three times a week.

#56267

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