第一组:
http://www.i3721.com/gz/tbjak/g1/g1xkbyy/200606/77797.html
http://zhidao.baidu.com/question/15112150.html
[第一个网址好点]
第二组:
join in = take part in 参加某项活动
join + 组织，或者join sb
take part in参加活动
例句，My father joined the Party in 1988.我爸爸是1988年加入共产党的。
Why not join the club?为何不加入俱乐部呢？
When did your brother join the army?你兄弟什么时候参军的呀？
Both he and I will take part in your birthday party. 我和他都会来参加你的生日晚会。
Why didn't you take party in the meeting?你为何没有参加会议啊？
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