Several days has passed_______the air crash(空难) happened. A.since B.after C.as
---Would you mind my sitting here, sir? ---_________. It’s for my wife.
It’s clever________ Amy to make a birthday cake, but it’s hard _____ me to do that.
You have finished most of the work, so you ______ start working so early tomorrow. You ______ come at 9:00.
We still don’t know what _________ while we were away from home.
Could you tell me ______ there?