用方框中的单词填空
(1)I think taking a walk(散步) is very ____.
(2)He doesn't like Chinese. He thinks it is ____.
(3)This book is very ____. We can learn a lot from it.
(4)His brother is ____. We like playing with him.
(5)The math problem is too ____. I can't work it out(解出).