“I don't think it's my ________that the TV blew up. I just turned it on，that's all，”said the boy.

The UN Climate Change Conference in Copenhagen was held in a tense ______ due to lack of deep understanding.

 With no better way to express feelings of love and         , it’s easy to see why everyone turns to the flower shop on Mothers’ Day.

Hiking by oneself can be fun and good for health. It may also be good for      building.

----How do you like our city? ----It has changed beyond all _____ in the past 20 years, a completely new one in front of me.