fun

夏天参观水族馆很有趣。

It is ___fun to visit an aquarium in summer.

观看海豚和海狮表演既有教育意义又很有趣。

Watching the dolphin and sea lion shows is both educational and ___fun.

即使所有课程结束后，这仍是一种继续学习的有趣方式。

It's a ___fun way to keep on learning even after all my classes are over.