It is common __________ that a certain amount of regular exercises improves the health whether or not exercise adds to the length of life.
| A．evidence | B．experience |
| C．practice | D． ignorance |
— Thank you very much for giving me a hand when I was in trouble.
— Don’t mention it. I only did what anyone else _______ in my place.
| A．must do | B．could have done |
| C．would do | D．can have done |
As to the long-term effects of global warming some believe that the damage has been done, ______________________.
| A．otherwise we take steps to make up now |
| B．now that we take steps to make up |
| C．whether we take steps to make up now or not |
| D．unless we take steps to make up now |
He glanced through the guide book, ___________ only those pages __________.
| A．reading, concerned | B．to read, concerned |
| C．having read, concerning | D．reading, concerning |
What best quality ______ most people _______ in others is the willingness to admit one’s mistakes.
| A．which, approve | B．/, appreciate |
| C．that, impress | D．where, regard |
Theoretically, a good screwdriver should last a lifetime, but it rarely___________, usually because it is used at one time or another as ___________ some other tool.
| A．should, a favor for | B．should, a lack of |
| C．does, a way of | D．does, a substitute for |