This problem is too simple.

I take supplements every day to supplement vitamins.

He lost in the match.

She saw a distant mountain.

She shyly hid her cheeks that had turned red.

In response to the enemy's attack, we are considering a retreat.

I use a microscope for biology experiments.

This fabric has high color fastness, so it is hard for the color to fade even when washed.

I used an optical microscope for an experiment at school.

We will go to the flea market on Sunday.