1 . If Nina __________ that her husband would go to the bus stop to meet her, she wouldn’t have walked back home.

A．knows

B．knew

C．has known

D．had known

2 . If my lawyer _________here last Saturday, he _________me from going.

A．had been; would have prevented	B．had been; would prevent
C．were; would prevent	D．were; would have prevented

3 . With the deadline drawing near, I am getting more and more anxious about the final exam.         I started to review my lessons several days in advance, I wouldn't have burned the midnight oil last night.

A．If

B．Had

C．Should

D．Were

4 . Scientists all agree that if he had actually touched the key, he _______ from the electric shock.

A．must have died

B．should die

C．would have died

D．has been dead

5 . If I ________ to study, I couldn’t have passed the exam.

A．hadn’t stayed up

B．didn’t stay up

C．haven’t stayed up

D．shouldn’t stay up

6 . If the Houses of Parliament had not been burned down in 1834, the great clock __________never have been erected. (根据句意填空)

7 . I went to the party.
I met my future wife.(用if将句子合并为虚拟语气)

8 . 如果他没有熬夜，他的健康就不会如此容易垮掉。
If he hadn’t stayed up, __________ __________ __________so easily.

9 . Mom ___________ happy if I had ______ Jonny _______.
如果我当时把Jonny 扔下的话妈妈不会开心的。

10 . 我当时太忙了，否则我就帮助她了。（汉译英）