______ the Internet is of great help, I don’t think it is a good idea to spend too much time on it.
| A．Unless | B．Since | C．When | D．While |
In fact, it has one-third of the world’s fresh water, and much of ___ is in the Great Lakes.
| A．it | B．them | C．which | D．what |
The earth became so violent ____it was not clear ____
the shape would last or not
.
| A．which; whether | B．that; what | C．what; if | D．that; whether |
I wonder if you’d mind ___________ a few questions.
A
. we askingB. us asking C. our ask D. us to ask
Now if you _____ excuse me, I think I’ll be ____ my way.
A. will; inB.will; on C. can; by C. can; in
A modern city has been set up in _____ was a wasteland ten years ago.
| A．what | B．which | C．that |
D．where |