---Have you seen _____ Audi car? I parked it here two hours ago, but now it’s gone!
---Is it _____ black one? A young man has just driven a black car away.
| A．an…a | B．the…the | C．the… a | D．an…the |
It was only then ______ I began to have doubts about whether my story had ever been told.
| A．when | B．Since | C．that | D．yet |
The secretary worked late into the night, ______ a long speech for the president.
| A．to prepare | B．prepared | C．preparing | D．to be prepared |
There is no doubt _______ nearsightedness is a serious problem among the youth of our country.
| A．/ | B．which | C．whether | D．that |
You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.
| A．affected | B．interrupted | C．involved | D．disturbed |
It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.
| A．that | B．when | C．which | D．where |