.—What do you think of the performance yesterday evening?—Great! is o’Henry style.

The final tests are coming, and the students _______ hard for them these days.

How clean the room is! —Yes，I am sure that someone _______ it.

I can’t connect my computer to the Intemet. There must be ______ wrong with it.

The school _______ I visited the other day was not the one _______ I once studied.