1 . He ________ have finished writing the paper. He hadn’t written a single word when I left him fifty minutes ago. (用适当的词填空)

2 . She ________ (participate) in the activity, for she was doing paperwork in the office then. （用适当的词填空）

3 . She ________have participated in the activity, for she was doing paperwork in the office then. (用适当的词填空)

4 . I didn’t see her in the meeting room this morning. She __________ not have spoken at the meeting. (用适当的词填空)

5 . George ________ (not go) too far. His coffee is still warm. (所给词的适当形式填空)

6 . Bill ________ (go) too far. His coffee is still warm. （所给单词适当形式填空）

7 . （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.

8 . He ________ your car by mistake because he didn't have the keys.

A．mustn't have taken	B．shouldn't have taken
C．couldn't have taken	D．needn't have taken