_____ on the MSN，some people often use “88” for “goodbye”．
| A．When chat |
| B．When chatting |
| C．When chatted |
| D．When to chat |
—Excuse me, sir. Would you do me a favor?
—Of course. What is it?
—I ________ if you could tell me how to fill out this form.
| A．had wondered | B．was wondering | C．would wonder | D．did wonder |
—Which flight ________ ? —I want to catch the 13:00.
| A．you are to catch | B．are you catching | C．do you catch | D．have you caught |
—You must have met him the other day. —Oh, no, I ________ .
| A．hadn’t | B．mustn’t | C．haven’t | D．didn’t |
— Have you ever worked with a tape recorder?
— I ________ it a lot when I was studying French in school.
| A．used | B．was used | C．have used | D．had used |
— I called you at ten, but there was no reply.
—Oh, that was probably when I ________ a shower.
| A．am taking | B．took | C．were to take | D．was taking |