1. I am always amazed when the circus is over and they are still ______. I know they ______ themselves. (themselves)

Возможное восстановление: I am always amazed when the circus is over and they are still enjoying themselves. I know they enjoy themselves.

Здесь используются формы глагола enjoy: Present Continuous для действия в данный момент и Present Simple для общего утверждения.