(届湖北省黄冈市高三年级3月测试英语试卷)According to the latest research, getting enough sleep is _____to maintaining good health and reducing stress.
Tom and Jack are both very clever. ________, Tom is _______ Jack.
_____, the players began the game.
--- Is that 120? My brother is seriously ill! ---Ok. Help is _________ .
Have you realized the difficulty we have ____ the problem?
I think that ____ very difficult to learn.