1 . During our trip to the Great Wall last week, I couldn’t stop thinking about how huge a project it ________ have been to build it in ancient times.

A．must

B．could

C．should

D．need

3 . During our trip to the Great Wall last week, I couldn’t stop thinking that building it ________ have been a huge project in ancient times.

A．should

B．must

C．could

D．need

4 . This ___________an improvement, but “breakthrough” was an overstatement.

A．can have been	B．should have been
C．may have been	D．need have been

5 . ---Did you punish him for losing your digital camera？
---Yes, but I don't think I ______．

A．should do that	B．need to have done so
C．ought have done that	D．should have done so

6 . Jenny _______ have kept her word. I wonder why she changed her mind.

A．must

B．should

C．need

D．would

7 . You ________ in person; a telephone would have been enough.

A．couldn't have come	B．needn't have come
C．shouldn't have come	D．mustn't have come

8 . I        my homework yesterday, but unfortunately I forgot about it totally.

A．need have handed in	B．should have handed in
C．must have handed in	D．may have handed in

9 . I needn’t have been in such a hurry. The flight to Hong Kong _____ due to the typhoon.

A．has cancelled	B．was cancelled
C．will be canceling	D．had cancelled