Doing lots of listening practice is one of the secrets _____ becoming a good language learner, [ ]

There are over ______ books of all kinds in the library.

______ will she finish reading the magazine?— In three hours. [ ]

Tommy, do you know if Frank ______ to the theatre with us this Sunday if it ______? -Sorry, I have no idea.

How did the Chinese doctors get to Haiti (海地) to help the people there? — They got there ______ plane. [ ]