He committed another crime while on probation.

Thanks to the road safety mirror, I can drive safely even at dangerous intersections.

His body showed a rejection reaction to the transplanted organ.

His single word triggered a chain reaction, and everything changed.

He lost everything.

This chemical reaction is very dangerous.

She overreacted to his words.

Nuclear reactions are used for mass production of energy.

She is planning a date with her current boyfriend.

My boyfriend gave me a gift.