Low – carbon lifestyle is of great benefit to improve the world environment．        can be enjoyed from it until you have a deep understanding of it, however．

 In the first book, Lyra’s scientist father makes ______ possible to enter other worlds.

I wanted to buy a comic book for my cousin,but there was_______left in the shop.

Is there _______ wrong with you today?

---How many employees are there in the company? ---We have       500 people working there.