他被这个笑话逗乐了。

The joke made him ___laugh.

听到这个有趣的故事，孩子们都开心地笑了起来。

The children ___laugh happily when they hear the funny story.

孩子们看到小丑的滑稽表演都大笑起来。

The children started to ___laugh when they saw the clown's funny performance.

当她看到那只穿着衣服的狗时，忍不住笑了起来。

She couldn't help but ___laugh when she saw the dog wearing clothes.