normal

今天天气很正常，不冷也不热。

The weather today is ___normal, not too cold or too hot.

对于一个孩子来说，害怕黑暗是正常的。

It's ___normal for a child to be afraid of the dark.

考试前感到紧张是正常的。

It's ___normal to feel nervous before a test.