—Growing population resulted in growing rubbish.—There is ______that rubbish will become the major threat to human beings in future.

Hearing the loud noise，the boy looked out of the window,__________.

 This magazine is very __________ with young people, who like its content and style. 

You can see that the young graduate is just of _____ height. 

Never form the habit of smoking because it ______ human beings.