I reserved a single room.

We booked a double room.

He likes to take a walk in the park at dusk.

Kei is my best friend.

He is an expert in petrochemistry.

His self-centered attitude of only acknowledging his own opinions is causing resentment from those around him.

His jokes often turn out to be many a true word spoken in jest.

He is suffering from the consequences of his own actions. It's truly a case of reaping what one sows.

He was able to find a solution from a difficult situation.

He won the game with a strategy of winning by a surprise move.