It was on July 1, 2006 ___ Qinghai-Tibet railway began operation, ____ is a symbolic project in China’s West Development Strategy．
| A．when; that | B．that; when | C．which; when | D．that; which |
—Have you handed in your schoolwork yet?
—Yes, I have. I guess it ______ now.
| A．has graded | B．is graded | C．is being graded | D．is grading |
You can never imagine what great ________ we had _______ your school last time.
| A．difficulty; finding | B．difficulty; to find | C．difficult; finding | D．difficult; found |
— _______
— I said you’d better go by bus.
| A．Sorry, I don’t know. | B．I beg your pardon, sir? |
| C．What would you say? | D．Why not say again? |
I ______ for London tonight, for there is ______ an important meeting there.
| A．am leaving; having | B．leave; to be |
| C．am going to leave; having | D．am leaving; to be |
----I _____this morning, but he could not come.
----Well, we’d better go and _____at his office.
| A．called him; call on him | B．called on him; call him |
| C．called at him; call | D．called him; call at him |