1、riding
2、happy
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1、riding (be动词后面的动词形式有三种可能:
-ing:现在进行时, I'm trying to give you the right answer.
-ed:被动语态, I'm told that you don't know her.
-to do: 表示按计划或安排要做的事。)
2、happy
1.Peter is__riding___(ride) his bicycle.
2.The pond is too quiet.The tortoise is_happy____(happy).
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1,riding
2,unhappy