1 . ________you be fired, your health care and other benefits will not be immediately cut off. （用适当的词填空）

2 . He _____ his potential had it not been for his desire to meet new challenges.

A．would never have realized	B．would never realize
C．never realized	D．had never realized

3 . Should the need a________ for extra staff, we will contact you. (= when necessary) （根据英文提示单词拼写）

4 . ________they abandoned their dreams, they wouldn’t have achieved their success. (用适当的词填空)

5 . Had those customers___（预定） in advance， they wouldn't be standing in line now. （根据中文提示填空）

6 . I didn’t know he was in the company. _______it, I_______then.

A．Had I known; would call on him

B．Should I know; would have called on him

C．If I knew; would call on him

D．Had I known; would have called on him

7 . What a relief! We would be still waiting anxiously in the classroom _______to bring an umbrella with you.

A．should you forget	B．had you forgotten
C．you should forget	D．you had forgotten

8 . ____ then what I know now, I would have made different decisions.

A．Should I know

B．I knew

C．I did know

D．Had I known

9 . What a pity! The parents could have survived the earthquake, __________ to save their child.

A．had they not come back	B．have they come back
C．did they not come back	D．did they come back

10 . It might have saved me some trouble      the schedule but unforgettably no one told me about it.

A．did I know

B．have I known

C．do I know

D．had I known