她成为了全国网球比赛的冠军。

She became the ___champion of the national tennis tournament.

他一直公开为弱势群体的权利发声。

He always ___champions the rights of disadvantaged groups in public.

她一直为环保事业奔走呼吁，是公认的环境保护捍卫者。

She has been a dedicated ___champion for environmental protection causes.