根据短文内容，故答案选择正确答案。

    Look at these things.This is Mr.Green's watch. It's yellow. That is Jim's English book. It's blue. Jim likes English. He is my cousin. He reads(读)English every day. Oh，what's that over there？ It's a white key. It's Miss Green's. Look at the card. What card is it？It is a school ID card. The number is 20133082. Is the card Mary's？No，it isn't.I think it is Bob's. Bob is my brother. He is looking for(正在寻找)his school ID card. What about this dictionary？It's Helen's. And the green pen is hers，too.