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.

活泼好动对于幼儿来说是正常的。

Active behaviour is ___normal for young children.