Jane and Mary 可以看成是一个整体吗?

Jane and Mary 可以看成是一个整体吗? The book shelf over there is ------填所有格,是Mary's and jane还是Mary and jane's Jane and Mary ( ) 21 years old Dear Aunt Mary,Jane and I. Mary's and Jane's /Mary and Jane's ( ) fathers work in the same company. Both Mary and Jane understands English.为何不是understand? Both mary and Jane like music.(改同意句) Mary and Jane are twins.But they are( ). Mary is eight and Jane is nine.改为同义句 Jane and Mary are sisters.T--------- parents are teachers 1.Mary and Jane are in the same grade.(改写,意思不变)Mary and Jane are（）in（）grades. Mary and Jane are in the same grade改写意思不变Mary and Jane are （ ）in（ ）grades 小学试卷中六、 阅读理解（20分）3.Mary is heavier than Jane.到底是对还是错!改卷的答案是√.六、 阅读理解（200分）Mary,Jane and May are very good friends.Mary is shorter than May,May is heavier than Jane.Jane is thin MARY JANE到底是谁我在很多歌手的歌曲中总会听到MARY JANE这个名字,她到底是谁,又是个怎样的人呢?还是就是一种精神状态?一种文化代名词?希望可以得到解答, mary jane是一种鞋子的款式?还是一个名媛? 英语翻译再加上：Jane and her friend Mary are in Jane is bedroom.They are listening to a tape. Mary can’t use chopsticks and _______ .A.neither can Jane B.Jane can neither C.so can’t Jane D 2,The two desks here are _____.You may use the desk over there.A MARY and JANEb Marys and Janesc Mary and Jane`sd Mary`s and Jane`s