找出不同类的单词。
( ) (1)A. actor B. father C. teacher D. cleaner
( ) (2)A. cloud B. rain C. sun D. seed
( ) (3)A. classroom B. bookstore C. salesperson D. shoe store
( ) (4)A. bus B. foot C. plane D. subway
( ) (5)A. east B. west C. straight D. south