Having taken our seats, ______.
| A．the professor began the lecture |
| B．the lecture began in no time |
| C．we were attracted by the lecture immediately |
| D．the bell announced the beginning of the lecture |
—What's the terrible noise?
—The neighbours __________ for a party.
| A．have prepared | B．are preparing | C．prepare | D．will prepare |
—Doyou think we should accept that offer?
—Yes, we should, for we ______ such bad luck uptill now, and time ______ out.
| A．have had;is running |
| B．had；is running |
| C．have；has been run |
| D．have had；has been run |
—Haveyou got any job offers?
—No. I __________
| A．waited | B．had been waiting | C．have waited | D．am waiting |
Teenagers __________ their health because they play computer games too much.
| A．have damaged | B．are damaging | C．damaged | D．will damage |
I __________ my guest off at the station tomorrow.
| A．am seeing | B．see | C．saw | D．have seen |