He was paying attention to the teacher's talk during the class.

We always pay attention to the maintenance of this machine.

He is learning how to operate the new machine.

He always keeps a smile on his face.

We need moderate exercise to maintain our health.

Please cross the road with caution.

Please be careful when crossing the road.

After having a meal at the restaurant, I paid the bill.

Have you already made this month's payment?

I go jogging every day.