_______over everything whenever we want to make a decision, many people believe, and we will have less chance of making mistakes.

________ blood if you can and many lives will be saved.

__________at the door before you enter the office，or you’ll be considered impolite

________ the kids had when they experienced the first snowfall--in the South.

 　　　　great progress it has made since Hong Kong returned to China in 1997.