This kind of stories instructive while stories of that kind harmful to children.
| A．is; seems | B．are; seem | C．is; seem | D．are; seems |
In 1986, the Chinese government ________ a law stating that by the year 2000 every Chinese child would have nine years of compulsory education.
| A．impressed | B．introduced | C．interrupted | D．instructed |
Their products enjoy 30 percent ________ of the market in this country because both the quality and their service are fine.
| A．features | B．shares | C．interests | D．sales |
With temperature ________ so rapidly, we could not go with the experiment.
| A．fall | B．falling | C．fallen | D．to fall |
How did it ________ that the ancient building was burnt down in an hour?
| A．happen | B．occur | C．take place | D．come about |
—An ant has two stomachs—one for itself, one for others.
—Really? Quite interesting. I ________ anything about it.
| A．don't know | B．have known | C．haven't known | D．didn't know |