If your best friend tells you his secret，it's ___ for you to keep them for him．By doing this，you can win others'trust．（ ）
| A． |
special |
B． |
necessary |
C． |
possible |
There are about three students in our school．（ ）
| A． |
thousands |
| B． |
thousands of |
| C． |
thousand |
| D． |
thousand of |
What did you do last night， Grace？
First， I did my homework， and then I played piano for 30 minutes．（ ）
| A． |
a |
B． |
an |
C． |
the |
D． |
/ |
Mum， I have a bad headache． I feel terrible．
Oh， dear! You must get a cold． I have to take you to see ．（ ）
| A． |
a violinist |
| B． |
a doctor |
| C． |
a policeman |
| D． |
an engineer |
If you use mobile phone while driving， you by police．（ ）
| A． |
are caught |
| B． |
will catch |
| C． |
will be caught |
My father was watching TV while I to the radio．（ ）
| A． |
listened |
| B． |
was listening |
| C． |
am listening |