语法填空。
Bill and Mary (be)brother and sister.They both(两者都) like music.They think music is (relax).Mary can play the piano,she can't play the violin.Bill can play the piano,and he is good at (play)the violin,too.
However,he can't play drums.These (day),their school needs some musicians the school music festival.Mary and Bill want (join)it.The teachers ask them what they can do.Mary plays the piano and Bill plays the violin in the festival.Their shows are (real)good.The teachers are very pleased(满意的) with them.They become famous in (they)school.