题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

With the development of modem technology, people can stay 1. (connect) with their families and friends easily, however far apart they are from each other. WeChat is one of the most 2. (frequent) used means of communication in China. It is reported that the number of the WeChat users 3. (reach) over 1.1billion so far.

Once joining the WeChat, people can find more and more people start to add them 4. friends. They don’t have to consider time 5. (zone) when communicating. Another reason why ifs so popular is that it costs nothing. It’s also very convenient for people to immediately update 6. they are doing by WeChat.

However, addiction to WeChat will rob people of the time that should otherwise 7. (spend) on something more important. And the many so-called friends on it are not really friends at all, who simply want 8. (put) ads or sell items on Moments. Besides, people on the Wechat are more likely to compare 9. (they) with others, which will make them feel bad when finding some people seem to be 10. (success).