The young mother won't leave her baby _______ she is sure that he has already been asleep．（ ）
A．unlessB．becauseC．ifD．since
Of all the students in my class，Lily studies ．（ ）
| A． |
most carefully |
| B． |
carefully |
| C． |
more carefully |
﹣﹣﹣Can you drive on the right﹣hand side of the road in China？
﹣﹣﹣ That's a rule．（ ）
| A． |
Yes，we can |
| B． |
Yes，we must |
| C． |
Yes，we should |
Americans always use to have meals while Chinese use chopsticks．（ ）
| A． |
knife |
B． |
bowl |
C． |
forks |
Would you like to go to the movie with me tonight？
．See you then．（ ）
| A． |
No problem |
B． |
I'm not free |
| C． |
Yes， please |
D． |
I'm not sure |
Could you please tell me ？
Yes． He went there by plane last week．（ ）
| A． |
where Mr． Brown will go |
| B． |
how Mr． Brown went to Beijing |
| C． |
how long Mr． Brown has been in Beijing |
| D． |
when did Mr． Brown go to Beijing |