给下列单词归类（同一类的单词写在同一个苹果内，只写序号）。
Apples are sweet _______ fall. A.onB.inC.at
---______ do you like summer? ---______ I can swim in the river. A.Why, BecauseB.Why, AndC.Which, Because
--- What is Mike doing? --- He ____________ A.runningB.swims in the river C.is walking
August is the ________ month of the year. A.sevenB.ninth C.eighth
---What's your favourite season? ---____________ A.I like fall best.B.February is my favourite.C.I swim in summer.
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