阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
(2015·吉林省吉林市第三次调测)
People can often see a talking parrot on a TV show, in a movie, or even in someone's home. The parrot has learned __1__(copy) sounds that people make. Dolphins, bats, and some apes also copy sounds. Now we can add elephants __2__ this list of copycats (盲目的模仿者)．
