With temperature ________ so rapidly, we could not go with the experiment.
A.fall |
B.falling |
C.fallen |
D.to fall |
How did it ________ that the ancient building was burnt down in an hour?
A.happen |
B.occur |
C.take place |
D.come about |
—An ant has two stomachs—one for itself, one for others.
—Really? Quite interesting. I ________ anything about it.
A.don't know |
B.have known |
C.haven't known |
D.didn't know |
Noise is unpleasant, ________ when you are trying to sleep.
A.especially |
B.specially |
C.extremely |
D.naturally |
—Was ________ problem solved?
—We were trying to think of ________ way out, but it was difficult to find one.
A.a; a |
B.a; the |
C.the; a |
D.the; the |
The couple have decided to________buying a car until their economic condition becomes much better.
A.hold off |
B.hold on |
C.hold up |
D.hold back . |