He once went streaking during his college days.

He was arrested for streaking.

Alkaline earth metals are located in Group 2 of the periodic table.

There is a disaster drill today.

The coin-operated parking was full, and I couldn't find a place to park my car.

I participate in aqua walking classes every Friday.

Smoking is prohibited in this park.

He is a diligent student.

He contracted severe invasive streptococcal disease and underwent emergency surgery.

He is suffering from acute leukemia.