He is an expert in public law.

This problem cannot be solved unless both sides cooperate.

My younger brother caught smallpox.

This radio is emitting music.

As a way of repaying the kindness of me helping him, he helped me repair my house.

He wrote a dazibao to protest against the government.

He revealed her secret in revenge against her.

He swore to take revenge on her.

He was surprised to see the bubble.

His dream is to climb to the peak.