根据句意和所给汉语提示，写出句中所缺单词的正确形式。

1.  If you want to look for _____ (乐趣), go to see the beautiful scenery in the countryside.

2.  In Class 8, some students' photographs are on _____ (展览) on the back blackboard.

3.  Don't _____ (错过) any good chances that you have.

4.  The teacher's class doesn't _____ ( 使……感兴趣) the students. It's boring.

5.  His expression _____ ( 暗示) that he didn't sleep well last night.