这个手势在你们国家是什么意思？

What does this gesture ___mean in your country?

忘记关窗意味着房间会被雨水打湿。

Forgetting to close the window will ___mean the room gets wet from the rain.

他总是对服务员很刻薄，真让人不舒服。

He is always ___mean to the waiters, which makes everyone uncomfortable.

这组数据的平均值是15。

The ___mean of this data set is 15.