Some people won't realize the importance of their health ____ they lose it．（ ）
A．becauseB．afterC．whenD．until
Which of the following signs means DANGEROUS？（ ）
| A． |
|
B． |
|
C． |
|
I'm going to Yichun for summer vacation． It's a good place to relax．
So it is． !（ ）
| A． |
Enjoy oneself |
| B． |
Have a good trip |
| C． |
Thank you |
Please read the before you take the medicine．（ ）
| A． |
introduction |
| B． |
explanation |
| C． |
instruction |
I think the environment is terrible these years．
Yes， it will be even worse the government takes action it．（ ）
| A． |
until； protect |
| B． |
unless； to protect |
| C． |
if； protecting |
This year is the 49th Earth Day and I think we should people not to too many trees．（ ）
| A． |
call on； cut down |
| B． |
call at； cut up |
| C． |
call in； cut off |
