—By the way，have you moved into the new house?
—Not yet．The walls ________．
A．were painted B．are being painted C．are painted D．are painting
It is reported that the floods have left about ________ people homeless．
A．two thousand B．two thousands C．two thousands D．two thousands of
Great attention must be paid ________ education，especially in the countryside．
A．develop B．to develop C．to developing D．developing
—Was it in April, 1970 that China ________ sending its first satellite into space?
—Yes, that's right.
A．succeeded in B．managed to C．attempted in D．tried to
As you know，it is my duty to________my younger sisters from being hurt when they are in danger.
A．prevent B．save C．stop D．protect
If no measures are taken, the special wild plant will ________ some day.
A．die out B．die away C．die down 
D．die off
