The real reason why prices ____ , and still are, too high is complex, and no short discussion can satisfactorily explain this problem.
If someone has toan action or policy, they are responsible for it, and may be required to explain it to other people or be punished if it fails．
| A．account for | B．make up | C．focus on | D．pay off |
One way to species under' threat of extinction - whatever the cause - is to remove them to zoos and parks and breed them there．
| A．betray | B．resist | C．preserve | D．dispute |
Having heard wolves howling in the forest, Lala her walk up the path to the caves fearing that there might be wild beasts lying in wait for her．
| A．accumulated | B．circulated | C．accelerated | D．calculated |
Smiling doesn't mean you're happy． Sometimes, it just means that you're strong enough to face problems．
| A．fortunately | B．eventually | C．deliberately | D．necessarily |
The officials of the National Ministry of Information Industry advise people to limit the personal information they make about themselves online．
| A．available | B．affordable | C．acceptable | D．valuable |