When I passed the classroom, I heard a girl ________ in it.
| A．sing | B．to sing |
| C．sang | D．singing |
WeChat（微信）is one of the most convenient ways of ．（ ）
| A． |
information |
B． |
competition |
| C． |
communication |
D． |
pollution |
Hi，Joan! I won the men's 100﹣metre race yesterday!
That's wonderful news．（ ）
| A． |
Never mind． |
B． |
You are welcome． |
| C． |
Congratulations! |
D． |
That's all right． |
The book is excellent．Could you tell me ？（ ）
| A． |
where did you buy it |
B． |
where you bought it |
| C． |
where do you buy it |
D． |
where you buy it |
You always be careful with electricity for safety．（ ）
| A． |
must |
B． |
can |
C． |
mustn't |
D． |
can't |
A hanfu show in Museum of History next week．（ ）
| A． |
is held |
B． |
was held |
| C． |
will be held |
D． |
has been held |