__________ is even more important is _________ the earth cooled down, water began to appear on its surface.
| A．What; that as | B．It; which |
| C．It; which as | D．What; which |
After reading a book or a magazine in the reading room , put it back_____it was.
| A．what | B．which | C． that | D．where |
Only with this method_____to make progress in your maths study .
| A．you can hope | B．you did hope | C．can you hope | D．did you hope |
The best way for starting a person’s breathing is to use______way
| A．face to face | B．mouth-to-mouth | C．face-to-face | D．mouth to mouth |
The question will also calm the person ,______him or her know that help is on the way .
| A．to let | B．lets | C．letting | D．to have let |
.His words were_____out by loud cheers from the crowd
| A．drowned | B．cried | C．expressed | D．crowded |