I don't know how to solve this situation.

He was carefully observing the surroundings.

He was drinking coffee as usual.

He has sensitive skin, so he needs to be careful when choosing cosmetics.

He is very sensitive to sound.

He is always smiling.

Toshi is my best friend.

He showed a quick response.

His quickness is one of the reasons for his success in business.

Toshi is always alert to his surroundings.