我想加入一家健身房来保持健康。

I want to ___join a gym to get fit.

你为什么不加入我们的俱乐部？真的很有趣。

Why don't you ___join our club? It's really fun.

如果你能加入这个美术班就太好了。

It would be great if you could ___join the art class.