Such a grammar mistake is ______ among the beginners of English study.
| A．normal | B．common | C．general | D．ordinary |
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 |
Only after a person has realized the importance of knowledge, ____________.
| A．he can devote himself to learn |
| B．he may devote himself to learning |
| C．can he devote himself to learn |
| D．can he devote himself to learning |