During the busy traffic time, some people prefer to ride bikes because it’s much______.

You’ll have an exam soon. I think you should spend ______ time on your homework.

If you want to be thinner and healthier, you should eat___food and take____exercise.

---You are quite different from your sister.---Yes. We are both short. But my eyes are ________ than ________.

–There is thick haze(雾霾)around many cities in China recently. What do you think of it ? ---I think __________ cars we drive, the less pollution the city has.