The radio says that a terrible traffic accident happened sometime ________ 8 a.m. ________ 10 a.m. this morning.
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.