1 . The boss ________ (go) far, for the cup of coffee is still warm and his car is still outside. （所给词的适当形式填空）

2 . 他们上周不可能见过这位雕塑家，因为他昨晚才出院。 (can)

3 . I ________ have been more than six years old when the accident happened.

A．shouldn’t

B．couldn’t

C．mustn’t

D．needn’t

4 . When       if he had any idea what the novel was about, Jack kept silent.
He      have read it very carefully.

A．asking; needn't	B．asking; shouldn't
C．asked; can’t	D．asked; mustn’t

5 . My sister met him at Ningbo Grand Theatre yesterday afternoon, so he         your lecture.

A．couldn’t attend	B．mustn’t have attended
C．shouldn’t attend	D．couldn’t have attended