短语讲解：

1. It took place over a period of two years, from 2012 to 2014.

take place 发生，举行
例句：When does the wedding take place?
什么时候举行婚礼?

2. It’s the way they communicate; it’s the way they keep in touch with their friends.

in touch with 与…保持联络
例句：You can get in touch with him there.
你可以打那里的电话联系到他。

3. Less sleep makes children tired and unable to pay attention in school the next day.

pay attention 专心
例句：We want you to pay attention.
我们希望得到你们的关注。