We will use pentane in this chemistry experiment.

My new fountain pen is easy to write with.

I lost my mechanical pencil, so I'm going to buy a new one.

My new pen tablet is very easy to use.

Propene plays an important role in organic chemistry.

I used pentyne in an organic chemistry experiment.

He was writing a letter with an old-fashioned quill pen.

I'm going to work, see you later.

I ran into an old friend by chance at the library.

I carry my lunch box every day.