You're the future of this country． Don't keep asking what this country can do for you． Ask_________ what you can do for this country．（ ）
A．usB．ourselvesC．youD．yourselves
This is____friend，Sam．（ ）
| A． |
I |
B． |
my |
C． |
me |
﹣﹣May I come in？____，please．（ ）
| A． |
Hold on |
B． |
Sit down |
C． |
Come in |
Boys and girls，look____the blackboard，please．（ ）
| A． |
at |
B． |
out |
C． |
in |
I will never forget the people help me a lot in my life．（ ）
| A． |
whose |
B． |
when |
C． |
which |
D． |
who |
We should study hard we can get much knowledge．（ ）
| A． |
when |
B． |
so that |
C． |
unless |
D． |
in order to |