His opinion is our litmus test.

There is a mock exam next week.

I have an oral examination tomorrow.

He passed the graduation examination.

We will conduct a practical test of the new product next week.

I ended up having to take a supplementary examination.

He holds the stockholder's rights of that company.

He used a litmus test paper to determine whether it was acidic or alkaline.

Paying the urban planning tax is a citizen's duty.

This room gets damp, so we need a dehumidifier.