第1题The headmaster wanted the classroom building__________as soon as possible.
A.to set up
B.to have been set up
C.to be set up
D.being set up
第2题__________they who did the thorough cleaning to the classroom yesterday.
第3题HOW many times did the clock__________?
第4题The largest meteorite on display is in the American museum in New York city over__________34 tons.
第5题He tried to__________his involvement in this robbery，but he finally confessed.