I’m continually losing my pens these days. I ______ them on my desk, but they disappear somehow.
| A．leave | B．am leaving |
| C．was leaving | D．would leave |
You should apologize _____ your mother _____ your rudeness.
| A．to; to | B．for; to | C．to; for | D．for; for |
People say that Vancouver is Canada’s most beautiful city, ______by mountains and the Pacific Ocean.
| A．surrounding | B．surrounded |
| C．being surrounded | D．is surrounded |
—Obviously, the boss looks happy again, doesn’t he?
—Yes. It’s said that he has ______ the difficult problem.
| A．succeeded in solve | B．tried to solve |
| C．managed to solve | D．been solved |
A concert will be held in our city _____ the great musician.
| A．in search of | B．in charge of |
| C．in memory of | D．in favour of |
We must do whatever we can _____ the river _____ any more.
| A．to keep; polluted | B．to prevent; being polluted |
| C．keep; polluted | D．prevent; being polluted |