在重要的演讲前感到紧张，对她来说是很自然的。

It's only ___natural that she would feel nervous before the big presentation.

开始一份新工作时感到有些迷茫是很自然的。

It's ___natural to feel a bit lost when you start a new job.

对于一个青少年来说，渴望更多的独立是一种完全自然的愿望。

For a teenager, wanting more independence is a perfectly ___natural desire.