—What’re you doing, Jack?—I’m looking for some information about famous people ______ I need to make a poster.
May I know if there is going to ______ a concert tonight?
If you go, _______.
I’m sure I’ve seen him ________, but I can’t remember the right place.
_________ we are very young, _____________ we can speak English well.
Had he studied harder, he_______ the exams.