-Can you tell me why you learn English so well?-It’s very simple._____ you work,______ grades you will get.
We knew little about Shu-How Lin, a basketball player from New York Knicks, _______ we watched the basketball matches in NBA.A. until B. if C. so D. because
—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!