_____you smell something burning？ Go and see what's happening．（ ）
| A． |
Can |
B． |
May |
C． |
Must |
D． |
Need |
What are you doing now？
I ___to the music．（ ）
A．is listeningB．am listening
C．Was listening
___do you have an English test？
Once a month．（ ）
A．How oftenB．How longC．How soon
___you ever ___to the Great Wall？
Yes，Three times．（ ）
A．Has，beenB．Have，beenC．Have，gone
Which subject do you like ___，English or math？
Of course，English．（ ）
A．wellB．betterC．best
Look out! Look at the traffic lights ____crossing the road．（ ）
A．beforeB．afterC．since