Why don’t you ______ your ideas on paper? Then you won’t forget them.— Sounds a good idea. [ ]

It’s good manners to be ________ while watching the raising of our national flag.

Computers cannot work without ______ from human beings.

下列各句中，加点的成语使用恰当的一句是(　　)

Do you think it’s ______ that fish sleep ___________