He started cleaning voluntarily.

A new approach is needed to solve this perpetual problem.

His house has a very modern design.

His secondary role greatly contributed to the success of the team.

He always keeps in mind the phrase 'If one learns without thinking, it is a waste.'

He couldn't hide his jealousy towards her success.

The mammoth is an extinct large mammal.

He is suffering from a disease.

She felt a sense of misery loves company with her friend who had been heartbroken.

Steam is rising from this pot.