Mr. Smith has been to many famous cities in China, _______ Chengdu has impressed him most.
| A．in which | B．on which | C．of which | D．with which |
—I missed the first part of the film. It was really a pity.
—You __________ home half an hour earlier.
| A．should go | B．must have gone | C．should leave | D．should have left |
We will be free tomorrow, so I suggest ________ to the history museum.
| A．to visit | B．visiting | C．we should visit | D．a visit |
The last factory ______ I am going to visit is the place _____ my mother worked five years ago.
| A．which; where | B．that; where |
| C．where; where | D．that; which |
I have told you the truth. ________ I keep repeating it?
| A．Must | B．Can | C．May | D．Will |
How long can you ________ your breath underwater?
| A．hold | B．take | C．keep | D．save |