An awful accident , however, occur the other day.
| A．does |
| B．did |
| C．has to |
| D．had |
The old man sat down and looked at me with a(n) _______ look on his face, which made me suddenly realize that I was still a helpful person.
| A．angry | B．calm |
| C．grateful | D．anxious |
There has been a _______ increase in the temperature on the earth for about 100 years, but few people notice it.
| A．loose | B．gradual | C．spare | D．fluent |
Though Mr. White is very busy with his business all day, he still _________ his three children and tries his best to get along well with them.
| A．cares about | B．comes about |
| C．brings about | D．sets about |
Whether at school or at home, children should be encouraged to read books and ______ what may be useful to their study.
| A．go down | B．settle down |
| C．break down | D．set down |
More and more people have lost their jobs. No one knows how long it will be before the nation _______ from its present trouble.
| A．returns | B．repairs |
| C．recovers | D．requires |