The essay requires perfecting
A.hand it over
B.hand over it
C.hand over
D.have handed it over

单项选择题（）you have worked out the hard problem, you shall have a rest first.

A.By now
B.Ever since
C.Now that
D.In that

单项选择题Speaker A: I have two tickets for the concert tonight. Would you like to come? Speaker B: ______A．I'd love to, but I promised my mother I'd take my sister to a show.B．Really? When did you buy the tickets?C．Why do you ask me to go with you?D．I can't because actually I'm not very keen on concerts.

单项选择题Speaker A: Do you mind if I open the window? Speaker B: ______A．Yes, please open the window.B．Yes, I do find it is very stuffy in the room.C．No, I don't. Don't open the window please.D．As a matter of fact, I'm feeling a bit chilly.

单项选择题Speaker A: Im worried about those classes I missed when I was sick. Speaker B:______A．I am glad that you have got well.B．Don't worry. Everything will be all right.C．I'll try to bring you up to date on what we've done.D．Maybe you should explain to our teacher why you were absent from class last week.

单项选择题Speaker A: Steve didnt have a chance of winning a gold medal at the Olympics. Speaker B: ______A．What a shame, but he'd done his best.B．I hope that he can win at the next Olympics.C．I'm sorry to hear that. He should have worked harder.D．It doesn't matter. He's still young and I'm sure he still has chance for the next Olympics.