--- Look! John is running on the playground. --- No, it be him. He has already gone to Xiamen. A. mustn’t B. can’t C. may not
—Humans can’t live _______ air. —I agree with you.
____ up late at night is bad for your health.
— ____ do you clean the classroom? — Three times a day.
He prefers _______ to __________.
There _____ an exciting party at Mr. Wang’s this evening.