(经典回放)When ________ asked about her family, she began to cry．

A．asking

B．asked

C．being asked

D．having asked

When ________ different cultures, we often pay attention to the differences without noticing the many similarities(相同点)．

A．compared

B．being compared

C．comparing

D．having compared

I was on the highway when this car went past followed by a police car．They ________ at least 150 kilometres an hour．

A．should have been doing

B．must have been doing

C．could have done

D．would have done

－The woman biologist(生物学家)stayed in Africa studying wild animals for 13 years before she returned．

－Oh! dear! She ________ a lot of difficulties!

A．may go through

B．might go through

C．ought to have gone through

D．must have gone through

He ________ have completed his work; otherwise(否则), he wouldn't be enjoying himself by the seaside．

A．should

B．must

C．wouldn't

D．can't

The weather turned out to be fine yesterday．I ________ the trouble to carry my umbrella with me．

A．should have taken

B．could have taken

C．needn't have taken

D．mustn't have taken

As you worked late yesterday, you ________ have come this morning．

A．needn't

B．mayn't

C．can't

D．mustn't

The man we followed suddenly stopped and looked as if ________ wether he was going in the right direction．

A．seeing

B．having seen

C．to have see

D．to see

It is too hot, you'd better have your hair ________ every 2 weeks．

A．cut

B．to cut

C．cutting

D．to be cut

Hard work is what it takes ________ everything well．

A．to do

B．doing

C．do

D．done