— How was your trip to the park?— It couldn’t be         . We lost our way and it kept raining. 

------Which do you prefer to live in, the city or the countryside? ------Of course in the countryside. The air is much _________.

–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.

---_________ clever boy your brother is!---So he is. He is_________ in my family.

—What’ s the low-carbon life style like? . —Save       energy, produce        carbon.