﹣I think collecting stamps is great fun. ﹣__________ We can also learn a lot from it. A. I agree with you. B. No, I don’t think so. C. No, I don’t like it.
–I think Mr Zhang may be in his office.
--No, he be there. I saw him just now.
A. needn’t, left B. mustn’t, leaving
C. can’t, leave C. shouldn’t, leave