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．

Is ________ man’s ability to reason that sets him apart from other animals?      

As the busiest woman in Norton,she made_________her duty to look after all the other people’s affairs in that town. 

Some friends tried to settle the quarrel between Mr.and Mrs.Smith without hurting the feeling of______,but failed.

Things have changed quickly over the past decade and life in the country is much better than ___used to be．