一道英语题用up,off,over,back,on或away填空1.He usually knocks ________

一道英语题
用up,off,over,back,on或away填空
1.He usually knocks _________at 6 o'clock, but today he's working late.
2.I'm going out now ,but I'll be _________in half an hour.
3.I gave _______smoking last year but Ihave just started again.
4.The concert was_________and everybody left the hall.
5.A new play is ________at the Phoenix.
6.I've given __________all my old furniture.