1 . Without your help, we _____________ our task on time. I cannot thank you enough.

A．can’t finish	B．couldn’t finish
C．can’t have finished	D．couldn’t have finished

2 . （1）________(have)the governments and scientists not worked together，AIDS­related deaths would not have fallen since their highest in 2005.
（2）George can't ________(go)too far.His coffee is still warm.
（3）Why didn't you tell me about your trouble last week？If you ________(tell)me，I could have helped.
（4）—Can't you stay a little longer?
—It's getting late.I really ________ go now.My daughter is home alone.
（5）It was so noisy that we ________ not hear ourselves speak.
（6）You ________ be Carol.You haven't changed a bit after all these years.
（7）You ________feel all the training a waste of time，but I'm a hundred percent sure later you'll be grateful you did it.
（8）You ________ be careful with the camera.It costs!
（9）—Sorry, Mum! I failed the job interview again.
—Oh, it's too bad.You ________ have made full preparations.
（10）I ________have worried before I came to the new school, for my   classmates here are very friendly to me.
（11）If I _______(see)it with my own eyes, I wouldn't have believed it.
（12）Without his wartime experiences, Hemingway ________(write)his   famous novel A Farewell to Arms.
（13）Ellen is a fantastic dancer.I wish I ________(dance)as well as her.
（14）I wish I _______(be)at my sister's wedding last Tuesday, but I was on a business trip in New York then.
（15）It is lucky we booked a room, or we ________(have)nowhere to stay now.

3 . Bob ________ hard. Otherwise, he ________to be admitted to the key university.

A．can’t work; wouldn’t have failed	B．can’t have worked; wouldn’t have failed
C．mustn’t have worked; wouldn’t fail	D．mustn’t work; would fail

4 . As you worked late yesterday, you____________ have come this morning.

A．mayn’t	B．can’t
C．mustn’t	D．needn’t

5 . —Where is Mick? I cannot find him anywhere.
—He ________ have been off long.I heard him make a call in the passage just now.

A．shouldn’t	B．can’t
C．mustn’t	D．needn’t

6 . Everything is amazing. Thank you all. We            without your help.

A．can’t make it	B．mustn’t have made
C．won’t make	D．couldn’t have made it

7 . —Did Max go to the concert with his family yesterday?
—The report scheduled to be handed in tomorrow, he _______ it.

A．couldn’t have attended	B．needn’t have attended
C．wouldn’t attend	D．shouldn’t attend

8 . Judging from her expression, she         the news that Charlie had returned from Britain.

A．shouldn’t have known	B．can’t have known
C．mustn’t have known	D．needn’t have known

9 . 一I think I saw Mr. Smith at yesterday's party.
一He ______ there. He is now on a business trip in Greece. And he left the day before yesterday.

A．mustn't have been	B．couldn't have been
C．might not be	D．should not be

10 . Thanks for your useful advice; otherwise I ______ such rapid progress.

A．didn’t make	B．couldn’t have made
C．hadn’t made	D．shouldn’t have made