Quantization is an important concept in physics.

This specimen was taken from a very rare type of rock.

It's dangerous to get the dose of this medicine wrong.

This is really a good problem, isn't it?

He has already finished writing the report, so we use the present perfect form.

Let's get to work immediately.

We were given a tour of the factory by the person in charge.

I can't stand his petty and insular attitude.

He was arrested for the crime of peculation.

How much does this luggage weigh?