__________ at the door before you enter my room, please.
| A．Knock |
| B．Knocking |
| C．Knocked |
| D．To knock |
Her shoes __________ her dress; they look very well together.
| A．suit | B．match | C．fit | D．compare |
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 |