John's score on the test is the highest in the class；________ last night.

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A．he should study

B．he should have studied

C．he must have studied

D．he must be studying

--Jim! Did you have a good time at the party?

--Yes, but I really ________ have been there because I had a lot of work to do.

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idea

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--You ________ him of the danger!

--I did. But he turned a deaf ear to me.

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A．must warn

B．might warn

C．could have warned

D．ought to have warned

Oh, I'm not feeling well in the stomach, I ________ so much fired chicken just now.

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A．shouldn't eat

B．mustn't have eaten

C．shouldn't have eaten

D．mustn't eat

--I hear you've got a set of valuable Australian coins. ________ I have a look?

--Yes, certainly.

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Much attention ________ pronunciation if you want to speak English well.

[　　]

A．should pay to

B．must be paid

C．should be paid to

D．will be taken of

When he was there, he ________ go to that coffee shop at the corner after work every day.

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--The room is so dirty. ________ we clean it? 

--Of course.

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You ________ forget what I told you. It's very important.

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