the old men do exercises every day to improve their____(fit)

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the old men do exercises every day to improve their____(fit)

the old men do exercises every day to improve their____(fit)
the old men do exercises every day to improve their____(fit)

the old men do exercises every day to improve their____(fit)
fitness

fitness

fit是动词,此处接在谓语动词后需要的是名词即fitness

fit是动词,此处需要的是名词fitness 表示“健康”。
希望能帮到你!