______ is even more important is that the earth cooled down, water began to appear on its surface.
| A．When | B．That | C．Which | D．What |
—Tom hasn't finished what he was saying.
—He.I already know what he has in mind.
| A．shouldn't | B．may not | C．can't | D．needn't |
in the study lost in thought for a long time, I suddenly realized that nothing in the world remains.
| A．Having sit; unchanged | B．To sit; unchanging | C．Sitting; unchanged | D．Sitting; unchanging |
It was really a wonderful match. If only Iit again.
| A．can watch | B．will watch | C．would have watched | D．could watch |
—Why did you leave the lights burning?
—Heavens! I guess Ito turn them off.
| A．would forget | B．had forgot | C．forgot | D．have forgot |
The sandstorm_ for several days，which left a terrible sight across the west.
| A．kept off | B．kept away | C．kept back | D．kept up |