By the time I got to the airport, the plane ________.
A. took off B. has taken off C. had taken off
Trees used to be________for cooking by the villagers in the 1970s．
A．cut up
B．cut down
C．cut off
—Excuse me，where is Mr．Brown’s office?
—Sorry，I’ve no idea．I________here for only a few days．
| A．works |
| B．worked |
| C．have worked |
| D．will work |
—How long________the film________?
—For about ten minutes．
| A．did；begin |
| B．has；begun |
| C．has；been on |
| D．has；been |
My father________a lot，but now he has given it up．
| A．used smoke |
| B．is used to smoking |
| C．was used to smoke |
| D．used to smoke |
My friend from America called me yesterday．We________for hours．
| A．chat |
| B．chatted |
| C．have chatted |
| D．had chatted |