I _______ some of my free time playing basketball for my school team.

Have you returned the book to the library _______?—Yes, I have _______ retuned it.

What are you going to do this weekend?—–I’m going to help _____the city parks with my classmates to make them clean.

Uncle Wang lives a farm , but he worksa factory.[ ]

Because the old people ________ about thirty percent of the population, we should care more about them.