He doesn’t feel very tied after the heavy work, because he is used to ______ for hours without a rest.
| A．work | B．working | C．works | D．worked |
The experiment shows that proper amounts of exercise, if ___ regularly, can improve our health.
| A．being carried out | B．carrying out | C．to carry out | D．carried out |
The discovery of gold in Sahara Desert led thousands to believe that a fortune________.
| A．is made | B．was to be made | C．would make | D．had made |
—Beg your pardon, but I didn’t quite catch what you said.
—Oh, I to myself.
| A．have talked | B．am talking | C．had talked | D．was talking |
—Does your uncle still smoke?
—He given it up. It’s two years ever since he .
| A．can’t have; smoked | B．may have; smoked |
| C．should have; has smoked | D．should have; didn’t smoke |
I have little doubt about his competence; ______, he is well-qualified for the job.
| A．although | B．because | C．moreover | D．yet |