We work together to achieve our common purpose: ____ world that is safer, cleaner and healthier than ____ one we founded.
| A．the; the | B．a; 不填 | C．a; the | D．the; 不填 |
The watch was very good, and he __________20 percent down for it.
| A．paid |
| B．cost |
| C．bought |
| D．spent |
I got to the office earlier that day，__________ the 7：30 train.
| A．caught |
| B．to have caught |
| C．to catch |
| D．having caught |
Would you like to __________ with us to the film tonight?
| A．come along |
| B．come off |
| C．come across |
| D．come through |
At school, some students are active __________ some are shy, yet they can be good friends with one another.
| A．while |
| B．although |
| C．so |
| D．as |
At the last moment, Tom decided to __________ a new character to make the story seem more likely.
| A．put up |
| B．put in |
| C．put on |
| D．put off |