He commanded that the students ______the classroom before he returned.
| A．didn’t leave | B．wouldn’t leave | C．not leave | D．couldn’t leave |
Just be patient. You _____ expect the world to change so soon.
| A．can’t | B．needn’t | C．may not | D． will not |
______ is often the case, we have worked out the production plan.
| A．Which | B．As | C．It | D．What |
I always have so many things to ______ when I come back to the company after a trip abroad.
| A．add to | B．contribute to | C．attend to | D．appeal to |
the problem of land erosion（侵蚀）getting more serious, the local government is searching for a way to deal with it.
| A．As | B．With | C．When | D．If |
In __________ most countries, a university degree can give you ______ flying start in life.
| A．the; a | B．the; / | C．/; / | D．/; a |