1 . I’m sorry.________ for my illness，I would have come and lent you a helping hand.

A．Were it not	B．If it were not
C．Had it not been	D．If it has not been

2 . ________ the rain stop，the crops would be saved.

A．Will	B．Would
C．Should	D．Had

3 . （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.

4 . ________(have)the governments and scientists not worked together，AIDS­related deaths would not have fallen since their highest in 2005.

5 . ________ for the free vegetables,women workers would not have gone to the supermarket so often.

A．If it is not	B．Were it not
C．Had it not been	D．If they were not

6 . ______ for the efforts of the builders, the Hongkong-Zhuhai-Macao bridge, called “the seventh miracle” by the Guardian, would not be completed, which astonishes the whole world.

A．Were not it	B．Were it not
C．Had not it been	D．If it were

7 . ________, the damage would be incalculable.

A．Should such a disaster occur	B．If such a disaster had occurred
C．Had such a disaster occurred	D．If such a disaster should be occurred

8 . We would celebrate the victory together _________ we win the game tomorrow.

A．would

B．should

C．shall

D．will

9 . ____________ what would happen the next day, they would have had second thoughts.

A．Were they to know	B．Had they known
C．Should they know	D．Did they know

10 . ________ he come tomorrow，I would let you know.

A．Would	B．Should
C．Shall	D．If