教小孩子的好处之一是他们充满热情。

One of the good things about teaching young children is their ___enthusiasm.

在那次事故后，他对这项运动失去了热情。

After the accident he lost his ___enthusiasm for the sport.

对于在美国加州营地度过两周，我满怀热情。

I am filled with ___enthusiasm about spending two weeks at Camp California in the U.S.A.