By the time you arrive home, I ____ ,so please don’t make any noise when you come in.A.have been sleeping B.would have slept C.had slept D shall be sleeping
What do you think ______ an apple ______ to the ground?
Why do you think ______ cut down the big tree?
—— ______ if I smoked? ——I'm sorry, but it's not allowed.
Do you think his tie is _________?
Mary said that she ___________ London.