___ you lose the paper document, sign in www. Sina.com, __ you might download all you need.
A. If, which B. So long as, what C. In case, where D. Even if, as
I have heard a lot of good things about you I came back from abroad.
A. since B. until C. before D. when
He wrote a letter ______ he explains what had happened in the accident.
A. what B. which C. where D. how
Do not let any failures discourage you, for you can never tell ________ close you may be to victory. A. how B. that C. which D. where
Microblog is a platform ________ people can express their thoughts and communicate with each other by sending posts.
A. which B. where C. what D. when
It was not until 1938 _________ the first colour TV programme was broadcast.
A. which B. that C. when D. on which
