Which do you prefer to use to keep in touch with your friends, QQ WeChat(微信)— WeChat, and I can share photos, ideas and feelings freely.

The piece of music sounds __________.

I’m sorry. I don’t know the way to the police station. I think he .

There is a new problem involved in the popularity of private cars ____________ road conditions need ____________.

How do you deal with the disagreement between the company and the customers–The key ________ the problem is to meet the demand _______ by the customers.