请教几个英文翻译和语法的问题?谢谢.

请教几个英文翻译和语法的问题?谢谢.
1/she hates to sit out dance.请帮忙翻译:sit out dance是什么意思?
2,when bob broke his leg in the accident,he couldn't walk for 2montgs.
为什么说是两个月前摔坏了腿,而不是现在呢.
3, almost everyone had finished the book?
答案是所有人都完成了.但是almost我记得是有否定的意思啊,就是几乎所有完成了,还是有人没完成.
4,a dozen of us went to the movie,but only five went to the reception.
答案是最后有7个人去看电影.但是我没看明白,我们12人去看电影,但是5个去了..前面12个人和后面的5个似乎没有关系啊.
5,at 20 of 9.
答案是:8:40,可是我怎么觉得是9点20呢.