题目内容
单句改错：下面句子有一处错误，请指出并改正。
As you can see on the sign, smoke is not allowed in the room．
Can you tell me how he reacted with your behavior?
That is impossible to master English without much memory work．
Is this the reason why he explained at the meeting?
When you are in face of sudden danger, you should stay calmly．
The Opening Ceremony of the Olympic Games was lasted for more than three hours and no one got tired of it．
