1 . ________ the traveller return, this stone would utter speech.（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

4 . I'm sorry.________it not been for my illness，I would have come and lent you a helping hand. (用适当的词填空)

5 . If it should rain tomorrow, we would not go climbing.
＝________it rain tomorrow, we would not go climbing. (同义句转换)

6 . If you had come earlier，you would have caught the bus.
＝________you come earlier，you would have caught the bus. (同义句转换)

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

8 . ________ anyone treat me like that, I ________ complain to the manager.

A．Should; would

B．Did; should

C．Would; might

D．Could; might

9 . ________ for the free tickets, I would not have gone to the films so often.

A．If it is not

B．Were

C．Had it not been

D．If they were not