【推荐3】Although most people can’t smell ozone (臭氧) under natural conditions, its smell may grow more unpleasant and even cause ____(comfort) as its amount in the atmosphere increases. (所给词的适当形式填空)

【推荐1】Below is an introduction ________ Romantic poetry. The aim of the Romantics was _________ (break) with the ideals of the 18th century: they refused _________ (follow) rigid rules; instead, they put ________ (emphasize) on the importance of imagination and feeling, the love of nature and a return to the past. (所给词的适当形式填空)