找出下面不同类的单词,把字母代号填入题前的括号中。10分
( )(1)A. you B. he C. who
( )(2)A. father B. thank C. sister
( )(3)A. grandfather B. afternoon C. morning
( )(4)A. photo B. what C. who
( )(5)A. elephant B. duck C. flower