He found out the truth and was surprised.

He is really knowledgeable and always teaches us new information.

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.

He is writing a sentence using traditional characters.

He lost everything.

She is planning a date with her current boyfriend.

Everyone was surprised by the news.

My boyfriend gave me a gift.

It's better for him not to know the truth. After all, ignorance is bliss.

He is feigning ignorance about that problem.