—Do you know anything about the players of our school basketball team?—Yes. They are _______ young boys between the age of thirteen and fifteen.
--Could you please _____ in the room? --Oh, I’m sorry.
_____ have you been swimming? For five years.
---He’s never been to an aquarium. ---_______.
Would you mind ______ those old jeans?
I have been skating _______ nine o’clock.