The boy saved every coin ______ he could buy his mother a gift.
| A．so that | B．in order to |
| C．because | D．although |
I couldn’t ____. The line was busy.
| A．go by | B．go ground | C．get in | D．get through |
The conference has been held to discuss the effect of tourism(旅游业) ___ the wildlife in the area.
| A．in | B．on | C．at | D．with |
Sandra was a student ____ the age of 21.
| A．at | B．in | C．on | D．for |
Scientists say they are beginning to _____ in the fight against cancer.
| A．break in | B．break out | C．break down | D．break through |
As the spring comes, the flowers began to _____.
| A．come out | B．come in | C．come on | D．come down |