Three new students have joined our class.

He opened his mouth in surprise.

Our group is five people.

You shouldn't tell him secrets because he has a loose tongue.

He eats fruit every morning.

This area is rich in limestone, forming beautiful landscapes.

She gave birth to a baby by Caesarean section.

This area is covered with layers of limestone.

This factory produces cement, which has calcium oxide as its main component.

Please cut the paper along this incision line.