He saved money to buy that expensive painting.

Photochemistry is a branch of chemistry that studies chemical reactions affected by light.

Photochemistry is a branch of science that studies how chemical reactions proceed under the influence of light.

There was no one there.

This sweater has a coarse material.

My family consists of exactly ten people.

There was no one there.

I tried to draw a picture of So.

My ancestors were engaged in agriculture.

Let's play outside.