---Alice, you look puzzled, Have you understood it?
---No．I _____another problem just now．
| A．l have thought of | B．am thinking of |
| C．had thought of | D．was thinking of |
You can go out, _________you promise to be back before 11 o'clock.
| A．as far as | B．so far as | C．when | D．so long as |
I ______ Mr White at that time, otherwise I wouldn’t have asked you for some information about him.
| A．hadn’t known | B．didn’t know | C．don’t know | D．haven’t known |
I’m surprised that some of these old houses after the earthquake.
| A．get up | B．stay up | C．put up | D．give up |
For a long time they walked without saying ____ word. Jim was the first to break
____ silence.
| A．the; a | B．a; the | C．a; / | D．the; / |
Unfortunately when we arrived she ___, So we only had time for a few words.
| A．just left | B．has just left | C．was just leaving | D．had just left |