圣诞节后我感觉身材走样，于是决定加入一家健身房。

I felt so out of shape after Christmas that I decided to ___join a gym.

这是个很棒的俱乐部。你为什么不加入呢？

It's a great club. Why don't you ___join?

如果你加入新的艺术课，那会很好。

It will be great if you ___join the new art class.