His explanation was impossible to understand.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

We conducted a questionnaire survey for the development of new products.

The next census will be conducted next year.

When will the next national census be conducted?

According to the latest public opinion poll, it has become clear that many people are in favor of environmental protection.

According to the latest public opinion poll, his approval rating is falling.