1 . He gave her a confident smile and his _________ (confident) made her faced with challenge bravely. (所给词的适当形式填空)

2 . Another unique human _________ (character) is that we walk upright. (所给词的适当形式填空)

3 . In a way, _________ are good for developing our strong characters and I like doing _________ work. (challenge) (所给词的适当形式填空)

4 . All men are born equal, so everyone hopes to be treated _________ because _________ is the basic demand.(equal) (所给词的适当形式填空)

5 . In addition to working with the animals, there’ll be _________ (机会) to explore the area’s natural treasures. (根据汉语提示单词拼写)