—Must I come before 7:00 tomorrow?—No, you ________.A. needn’t B. mustn’t C. couldn’t
—Shall I tell you about it? —No, you _______. Sandy has told me already.
The math problem is _______ difficult and _______ of them can work it out.
_______ of the students in our class _______ interested in micro blogs (微博) on the Internet.
_______ great fun it is to play games on _______ QQ!
---When will they ______? ---_______ the seventh of July.