Don't pretend ________ when you don't.
A. knowing B. know C. to know D. to knowing
There are forty-five students _______ in our class.
A. about B. or so C. around D. so
—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