______ is even more important is ______ as the earth cooled down, water began to appear on its surface.
A. What, that B. That, what C, That, that D. What, what
--- Catherine, will you visit us this weekend?
--- I planned to, but something unexpected _____.
| A．has come up | B．was coming up |
| C．had come up | D．would come up |
--- Talking of travel, have you ever been to Chicago?
--- Yes. I _____ it twice while I was working in the US.
| A．have visited | B．visited |
| C．was visiting | D．would visit |
To his delight, Tom quickly earned the trust of his girl friend and then _____ of her parents.
| A．one | B．ones | C．that | D．those |
In my opinion, the view Jennifer the other day is well worth discussing at this meeting．
| A．put forward | B．put out |
| C．put on | D．put off |
Only when the final examination was coming ______ he had quite a lot to do．
| A．he realized | B．he had realized |
| C．had he realized | D．did he realize |