I laughed so hard at his joke that my cheeks fell.

He asked me about the secret, but I remembered the proverb 'to fall into speaking', and said nothing.

This sushi is so delicious that it's jaw-dropping.

After hearing that explanation, everything finally made sense.

I draw my eyebrows using an eyebrow pencil.

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.