许多青少年都很隐秘。

Many ___adolescents are secretive.

儿童成长为青少年，拥有更多自由但也承担更多责任。

Children become ___adolescents with more freedom and yet more responsibilities.

一个青少年可能会经历快速的身体和情感变化。

An ___adolescent may experience rapid physical and emotional changes.