--A latest English newspaper, please!--Only one copy left. Would you like to have __________, sir?
I want to be a doctor when I _______.
— Which sport will you take part in? — The ______ race.
—Humans can’t live _______ air.—I agree with you.
He____know the answer, but I’m not sure.A. maybe B. may be C:may D. must
—_______ can I keep the books? —Two weeks.