This is a process happens when land becomes desert people cut down trees and dig up grass.
| A．when; because | B．that; because of | C．when; because of | D．which; because |
We expect her to do the housework as well _________ after the children.
| A．as look | B．as looking | C．and look | D．Looking |
I’d appreciate _____ if you would like to teach me how to use the computer.
| A．that | B．this | C．it | D．/ |
It was not until dark ______ he found that it was the correct way to solve the problem.
| A．that | B．what | C．which | D．when |
----Do you doubt _______ she can run the race?
---- Yes, I doubt _______ she can run against Liu Xiang
| A．that; whether | B．whether; that | C．that; that | D．whether; if |
I shall never forget those years ______ I worked in the factory with the workers,
______ has a great effect on my life.
| A．when, that | B．which, which | C．in which, when | D．in which, which |