根据图示，用英语写一篇题为“Changes in People' s Life”的短文，介绍过去和现在人们生活的变化。

要求：

1）书写要规范，词数在80词左右；

2）把图中所示内容表达完整，条理清晰，意思连贯；

3）开头部分已经给出，不计入总词数。

Great changes have taken place in people's life in the past 20 years. In the past people kept in touch with friends mainly by sending letters.