.
The bus hasn’t yet______, although it should have arrived here half an hour ago.
| A．turned on | B．turned off | C．turned up | D．turned down |
Why did they keep trying _________ they must have known it was hopeless?
| A．if | B．because | C．when | D．whether |
Having got up late this morning, Mike ran as fast as he could _______ to catch the bus.
| A．hope | B．to hope | C．hoped | D．hoping |
Their products enjoy 30 percent_____ of the market in this country because both the quality and their service are fine.
| A．share | B．profit | C．possession | D．advantage |
Although I admire you _____ your work on soil, I think you should apologize _____the villagers for the water pollution.
| A．for; to | B．to; for | C．for; for | D．to; to |
With ____ leaves ____ in the earth every year, the soil becomes richer and richer.
| A．falling; burying | B．fallen; buried |
| C．fallen; burying | D．falling; buried |