---The window is dirty.
----I know. It ______ for weeks.
| A．hasn’t cleaned | B．didn’t clean |
| C．wasn’t cleaned | D．hasn’t been cleaned |
Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.
| A．very | B．so | C．such | D．too |
— Hi, Henry, I’m going to China for my holiday.
— China? It is a country which is well worth .
| A．to visit | B．visiting | C．to be visited | D．being visited |
You should never lose ______ heart even if you are in ______ great trouble.
| A．/; / | B．your; / | C．the; a | D．a; the |
— What’s your opinion of the idea of building a museum in our town?
— . It’ll be good for all of us.
| A．I don’t agree | B．Well done | C．You’re right | D．Good idea |
For a moment nothing happened then all shouting together.
| A．voices had come | B．came voices |
| C．voices would come | D．did voices come |