-______is your office to your home?-It’s about 5 kilometers away from here.A. How far B. How long C. How often
— 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.
-My mother is ill in hospital.——_______.A.That’s OK B:.All right C.Thank you D. I’m sorry to hear that.