问题详情：
补全对话，每空一词
A: Why do you study English so hard?
B: Because it is very ____1____
A: ____2_____ ? How widely is English used?
B: Very widely. English is one of the working ____3____ at international meeting.
A: Which language is ____4____ by the largest number of people in the world?
B: Of course, Chinese. And now our country is ____5____ to the outside world, and more and more foreigners visit our country.
A: I see. Thanks.
【回答】
1. useful / important 2. Really
3. languages 4. spoken 5. open
知识点：补全对话
题型：补全对话
