If you are in the zoo, remember not to touch or go near the animals. Although some of the animals are cute, you _________ leave them alone.
--________ do you go to the supermarket, Amy? -- Once a week.
You should _______ smoking. It’s really bad for your health.
Now teenagers are very busy with their schoolwork and they have _____ time to do exercise.
Sam enjoyed collecting. He has collected over three _______stamps.
The old man can’t hear us well because there’s something wrong with his ______.