我的小狗在花园里追着自己的尾巴跑，真是疯了。

My puppy is ___mad chasing its own tail in the garden.

这么晚独自走回家，你一定是疯了！

You must be ___mad to walk home alone so late!

他花那么多钱买一个游戏，真是疯了。

He's ___mad to spend that much money on a game.