We believe the time and hard work _______ in completing such an important project are worthwhile.
| A．involved | B．involving |
| C．to involve | D．to be involved |
.
According to some doctors, one of the ways to prevent us from growing old is to make sure
that our brains get enough___.
| A．performance | B．exercise | C．experience | D．sport |
.
We are ____faced with the necessity to recognize that having more people implies a lower standard of living.
| A．readily | B．smoothly | C．unavoidably | D．deliberately |
.
Although many people view conflict as bad, conflict is sometimes useful _______ it forces people to test the relative merits of their attitudes and behaviors.
| A．by which | B．to which | C．in that | D．so that |
.
— I phoned you at 7 yesterday evening but nobody answered.
— Oh, I ________ my dog in the park then.
| A．walked | B．was walking | C．had walked | D．would walk |
.
Paris________ be a wonderful city but it’s not somewhere I’d like to live.
| A．might | B．would | C．must | D．can |