选择合适的单词填空。
We were ____ (surprising / surprised) that ninety percent of the students use the Internet every day.

These questions are very d____. We don’t know how to answer them.

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).