The students _______ busily when Miss Brown went to get a book she _______ in the office.
| A．had written, left | B．were writing, has left |
| C．had written, had left | D．were writing, had left |
To read newspaper before going to bed seemed to me a rule ____.
| A．to never break | B．never to have broken |
| C．never to be breaking | D．never to be broken |
It's no secret to us, but he alone is in the dark. It means ____.
| A．nobody but him knows the secret | B．we all know the secret except him |
| C．it's so dark that he can't see everything clearly | D．only the needs to keep the secret |
Every year, ____ graduates take pan in TOEFL for further education abroad.
| A．too much | B．several scores | C．many a | D．scores of |
In order to ____ the debt, the couple has worked hard for years with little food and only a small room to live in and never a moment's rest.
| A．pay for | B．pay back | C．pay | D．return back |
---What do you think of my suggestion?
--- Sorry. What's that? I ____ about something else.
| A．thought | B．am thinking | C．was thinking | D．had thought |