选出不同类的单词，把序号写在括号里。
You ＿＿＿ running and I ＿＿＿ dancing.
Look ＿＿＿ the people ＿＿＿ the park.
They are ＿＿＿ a boat.
-What are they doing? -＿＿＿＿ playing football.
选出不属于同类的单词。
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