How many times have you sung that song?

He has read thousands of books.

What floor is the library on?

How many times have you been to Japan?

His poem depicts a world of nothingness.

He always keeps the proverb 'Do not make friends with those who are not like you' in mind.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.