The room is ______ students. [ ]

The number of teachers in our school _______ greatly increased last term.A number of teachers in this school ______from the countryside.

Susan, did PrinceWilliam get married to KateMiddleton on April 29, 2011?—Yes, he_____for nearly a week.

Helen has no friends _______.

Tony knows China very well because he ______ in China for twenty years.