What's he interested in?
He is interested in computer. 
What club would he like to join?
I think he would like to join the computer club

重点词汇和句型
I'd like to join ... 此处的意思是“我想参加..”。“想要做..”还可以用I'd love to do ..i feel like doing ..等句式表达。
eg
I'd like to visit my aunt this weekend.
这周末我想去看我姑姑。
I'd like to show you some of my old pictures.
我给你们看看我的一些老照片。