You had better book rooms at the hotel in advance you should find no room on your arrival.

下列各句中，加点的成语使用正确的一项是

The prize will go to the writerstory shows the most imagination.

Can you finish the reports today?—Sure.I’ve _______ half of them already.

The number of teachers in our college _____ greatly increased this term. A number of teachers in this school _____ from the countryside.