( )__you exercise,__you become.(1)The more;the healthy(2)The more;the healthier(3)More;healthier(4)Most;healthiest?

The+ 比較級+主詞+動詞, the+比較級+主詞+動詞 愈~, 就愈~
因此答案是(2)

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(2) The more; the healthier---
adv. forming the cpomparative degree of most (adj and adv) of more than two words and of some od two words stressed on the latter.(=the healthiest)

(2)