---- Can you walk ______ faster?  ---- Sorry, I can’t. I am too tired ______ any more. 

–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.

I had to call a taxi because the box was ______ than I’d expected.

How can you study in the living room when other people are watching TV? I think you need a _______ place.

 Of all the stars, the sun is        .