听力原文：

People used to keep in touch mainly by sending messages or making calls. Now, most people are used to using WeChat. With the development of smartphones, it has become one of the most useful tools in the world. WeChat has the function of both computers and phones. People can send messages, photos, sound files and videos on it. WeChat helps its users save money. Users needn’t pay any money for sending messages, whether they’re photos or sounds. People can also talk through WeChat for free. What’s amazing is that we can share our feelings or opinions with our friends easily. At the same time, we can even download the articles we are interested in. Convenience is another important reason. Everyone can add friends from their phone contacts or by searching for the WeChat number online. But if we spend too much time on it, it will surely 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.

参考答案：

1. useful   2. send   3. save   4. add   5. influence