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