他是行业内首相最坚定的支持者之一。

He is one of the Prime Minister's strongest ___supporters within industry.

根据动物权利的支持者，人们不会喜欢被关在动物园里。

According to ___supporters of Animal Rights, people wouldn't like being kept in zoos.

她是环境保护的积极支持者。

She is a vocal ___supporter of environmental protection.