Rescuers are ______ for the safety of the two men trapped in the mine.
| A．grateful | B．concerned | C．extreme | D．frightened |
The train ______ at the present speed until it reaches the foot of the mountain at about nine o’clock tonight.
| A．went | B．is going | C．goes | D．will be going |
--- Did he notice you enter the room?
--- I don’t think so. He ______ to the radio with his eyes shut.
| A．listened | B．was listening |
| C．has listened | D．had listened |
--- Where do you think ______ he ______ the computer?
--- Sorry. I have no idea.
| A．has; bought | B．不填; bought |
| C．did; buy | D．不填; buys |
If you win the competition, you will be given ____ to Europe for two.
| A．a free 7-day trip | B．a free trip for 7-day |
| C．a 7-day free trip | D．a trip for 7-day free |
—What do you think of the book？
—Oh，excellent．It's worth ___________ a second time．
| A．to read | B．to be read | C．reading | D．being read |