A mailbag from a single sender addressed to one recipient, as the name suggests, is for delivering a bag of printed matter.

She laughed the way schoolgirls do, with her hand over her mouth.

They give part of their spare time to take care of the sick.

He applied his theory to his case.

He amassed a fortune in stock trading during the last boom.

Put one's finger on one's lips for silence.

He turned out to be a real disappointment after we went through hell and high water to find him.

The municipal council should concentrate more on specific issues.

The man put the gun against his forehead and squeezed the trigger.

There are cases where the rule does not hold good.

I'll call on you, John.

You can't apply this theory to this case.

This chapter will focus on the concepts of geometry.

This chapter will focus on the riddles of the planets.

I mean this money for your study abroad.