______ you are at home alone, please don’t leave the door open.
| A．While | B．As |
| C．Before | D．How |
—I’m amazed to hear that Frank and Linda have broken up.—________. They were walking happily hand in hand last time I saw them.
| A．So am I |
B．Neither am I |
C．Nor do I |
D．So do I |
I don’t think Linda could have done such a stupid thing last night, _________?
| A．do I | B．didn’t she |
| C．did she | D．don’t I |
The computer system ________ suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out |
| C．broke up | D．broke in |
I can’t believe that you got fined for speeding. I _________ of you as a careful driver.
| A．think | B．thought |
| C．have thought | D．am thinking |
If I ___________ the doctor’s advice and kept a balanced diet, I wouldn’t be in such a bad shape now.
| A．followed | B．had followed |
| C．should follow | D．have followed |