Can you come to the party this weekend？
Sorry， I'm going to take part in a competition， I must prepare for it．（ ）
| A． |
or |
B． |
but |
C． |
because |
D． |
and |
We use chopsticks every day and it is Chinese tradition．（ ）
| A． |
his |
B． |
your |
C． |
our |
D． |
their |
I would like to be ________ scientist in the future.They are so great.
| A． |
a |
B． |
an |
C． |
the |
- Will you take part in the Summer Camp this vacation？
- ________ .I'm not sure.（ ）
| A． |
Certainly |
B． |
Good luck |
C． |
No problem |
D． |
It depends |
- Is that man your friend Tom？
- That man ________ be him，because he has gone to Canada.（ ）
| A． |
can't |
B． |
mustn't |
| C． |
needn't |
D． |
had better not |
- English is difficult ________ at the beginning.
- Yes，but if you keep ________ ，you can make progress.（ ）
| A． |
to be learned；trying |
B． |
to learn；trying |
| C． |
to be learned；to try |
D． |
to learn；to try |