Mary is my cousin.She is only nine years old(岁).She is in Class 2,Grade 4.She likes sports.(A)She plays baseball every day.Her math teacher is Mrs.Brown.Mrs.Brown has a daughter.Her name is Mona.She is Mary's good friend.She is nine,too.(B)And she likes sports,too.But she doesn't like playing baseball.She likes playing pingpong.(C)她有九个乒乓球.She(D)________ some pingpong balls to school every day.