This charcoal-powered vehicle is said to be environmentally friendly.

He was carried on a stretcher.

My body has become flexible by doing stretching exercises every morning.

The great auk is a species of bird that has become extinct.

Let's go watch a Superman movie.

He is strong like Superman.

I bought a new pencil sharpener.

The pH of this liquid is 7.

I commute to school by bus every day.

Hippocrates is called the father of medicine.