下列每组单词中有一个是不同类，选出这个词（共10小题；每小题1分，满分10分）
David is________than his brother．So he always makes more mistakes．
I learned________a horse last year，and now I’m good at it．
Lily likes________books and magazines when she is free．
She’s not strong enough________walking up mountains．
Perhaps the famous football star won’t play________football any longer．
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