Complete the following sentences with appropriate words in the box. Change their forms if necessary.retainbiodiversesustainablerenewableaffordablecalamityubiquitousinsulation In the past few years, however, researchers have turned their attention to the role that green roofs can play in the conservation of ______ in towns and cities, where natural habitats are few and far between. 答案: biodiverseUnit 3 Civil engineering structure Unit 3 test