那个孩子在草地上蹦蹦跳跳。

The ___kid is jumping around on the grass.

这些孩子正在教室里学习新的英语单词。

The ___kids are learning new English words in the classroom.

你又在开玩笑吧，这故事听起来太离谱了！

You must be ___kidding, this story sounds way too crazy!