Every year， _________books are given away to the poor children in the countryside．（ ）
A．thousandB．thousands of
C．thousand of
Hi，Susan，When is Teachers' Day in China？
It's September 10th．（ ）
| A． |
in |
B． |
on |
C． |
at |
D． |
for |
Must he sing the song in English？
No，he____．（ ）
| A． |
needn't |
B． |
can't |
C． |
mustn't |
____fine weather we have today！（ ）
| A． |
What a |
B． |
How |
C． |
What |
I wish you a happy National Day!
_____．（ ）
| A． |
The same as you |
| B． |
Thank you |
| C． |
The same to you |
It's already tens of years____the world's population reached five billion．（ ）
| A． |
before |
B． |
after |
C． |
since |