He couldn't express his opinion because of his fear of his boss.

He cannot challenge new things because he fears failure.

I like finding fossils.

This tree has fossilized over thousands of years.

The use of fossil fuels is causing global warming.

This subfossil shows the life of creatures from thousands of years ago.

Her smile was shining brightly.

His name is Sansan.

He decided to participate in the meeting.

In this chemical reaction, iron reacts with oxygen and oxidizes.