— The room is dirty.
— I know. It ______ for several weeks.
A．hasn’t cleaned B．didn’t clean C．wasn’t cleaned D．hasn’t been cleaned
I don’t expect the children to be noisy, nor ________ them to be quiet.
A．I expect B．do I expect C．I have expected D．have I expected
It’s difficult to ___ these old books for some of them ______ none of the classification.
A．look for; are belonging to B．put up; belong
C．sort out; belong to D．pick up; are belonged to
Many kinds of animals and plants die _________ every year.
A．down B．away C．out D．from
We should do something to _______ the plant ______ the cold weather.
A．protect; from B．prevent; from C．protection; from D．prevent; against
I’d appreciate _______ if you would teach me how to use the computer.
A．that B．it C．this D．one
