Long TextExercise 21 of 90

Postage stamps are pieces of paper, with glue or adhesive on the back. They are put on the corner of an envelope to pay the fee for having the postal service take the envelope to where it is being sent. Philately is the study of stamps and postal history and other related items. It also refers to the collection…

• What we use to pay the fee for sending a letter is called
• Philately is