—Ann, I am worried I’m getting fatter. What shall I do?—I think you should eat________food and do more exercise.

—Wow! I’m full. The bread is delicious!  —That’s right! It will be ________ with better. Try next time!

- What’s the low-carbon (低碳) style life like? - Save _____ energy, produce _____ carbon.

Which one is ________,the white one or the black one?

 Of all the stars, the sun is        .