_______the road, be careful.
| A．While crossing | B．When cross | C．Crossed | D．Being crossed |
The number of students applying for this position __________ 320.
| A．added | B．added up |
| C．added to | D．added up to |
We offered these students a summer course, aimed __________ improving their spoken English.
| A．to | B．in |
| C．at | D．for |
__________ to go to university, we must work hard.
| A．So as | B．in order |
| C．So that | D．in order that |
The explorers were told to __________ themselves with everything they would need for the voyage.
| A．associate | B．equip |
| C．treat | D．feed |
The old teacher lay wide awake on his bed, __________ all the problems he had to deal with the next day.
| A．thought about | B．to think about |
| C．thinking about | D．having thought about |