You should keep working hard __you have passed the exam.
| A．if | B．because | C．even though | D．when |
Most students like the teachersunderstand them well.
| A．which | B．who | C．where | D．when |
—It’s difficult to get to the other side of the river.
—I think a bridgeover the river.
| A．should be built | B．should build | C．will build | D．has built |
Li Na is famous all the tennis fans in China know her.
| A．too; to | B．enough; to | C．as; as | D．so; that |
More and more people have a low-C life and the air is getting much
than a few years ago.
| A．clean | B．cleanest | C．cleaner | D．the cleanest |
—do you know so much about the UFO?
—I usually get the information by surfing the Internet.
| A．How | B．What | C．Which | D．Where |