1 . If it were not for the support of the teachers, the student could not overcome her difficulty. (用倒装结构改写句子)
___________ ___________ ___________ ___________ the support of the teachers, the student could not overcome her difficulty.

2 . ________ what was going to happen next, I would never have left her alone.

A．Had I known

B．If I know

C．If I knew

D．If had I known

3 . Had I known what the problem was, we could ________ (address) it.  (所给词的适当形式填空)

5 . You could come back by Friday ________ today, which can ensure your presence at my birthday party.

A．should you start off	B．did you start off
C．had you started off	D．would you start off

6 . “It might have saved me a lot of money”, Mr. Chen sighed, “________ timely from the stock market this July”.

A．did I withdraw	B．should I withdraw
C．have I withdrawn	D．had I withdrawn

7 . ____________ 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

8 .        house property tax come into effect, China might witness a fall in house prices.

A．Would	B．Should
C．Could	D．Might

9 . ______hard at college，you would have got a better job.

A．If you have worked	B．Had you worked
C．Were you working	D．Have you worked

10 . ________preparations from now on, she would be able to finish the essay on Sunday.

A．Would she make	B．If she make
C．Were she to make	D．If she had made