复习以下单词：

happy unhappy sad boss box brain zoo birth birthday
place birthplace mark birthmark fire fireplace
man men fireman firemen woman women boy girl
color colour black white blue red green pink
yellow purple brown gray skyblue
use author caterpillar together
a lot of = lots of
lettuce sale mate classmate schoolmate
why leave left carrot vegetable cotton
swimming trunks
start danger dangerous smell smelt

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