听力原文：

People used to keep in touch mainly by sending messages or making phone calls. Now most people are used to using WeChat. With the development of the smartphones, it has become one of the most useful tools. WeChat helps the users save money. People can send messages, photos, sound files, and even share their videos on it. They needn’t pay any money. Convenience is another important reason. Everyone can add friends from the phone book or by searching for the WeChat number online. But if we spend too much time on it, it surely will have a bad influence on both our health and our schoolwork. So as middle school students, we should learn to control ourselves and use it properly.

Question: What are the main advantages of using WeChat?

参考答案: 

Saving money and convenience.