—He is a very hard-working student.

— ______. As far as I know, he often burns the midnight oil.

A. You can say that again      B. Absolutely not

C. Heaven knows              D. No way

—Do you think he will do me a favor?

         —As far as I know, he is the last one to help others．He ____ be prepared to give you a hand, though．

         A．might            B．must                C．can           D．should

--- Do you think he will do me a favor?

--- As far as I know, he is the last one to help others. He _______ be prepared to give you a hand, though.

A. might        B. must                C. can                  D. should

—Jack is doing nothing at all but study Chinese.

— Tom was late for work this afternoon.

— _____？As far as I know, he is fairly punctual.

A.Why not         B. So what        C. How come  D. How about