This soldier __ jump into the water and saved the boy.

When it came to the topic whether students should take cell phones to school, nearly every student ___________ the discussion.

Their coming without notice really                    our difficulties.

---- You’re coughing badly, Martin．Why not give up smoking?---- Give up smoking? Easier said than done, Amy．Once you _____ the habit of smoking, it is very hard for you to______．

 A healthy life is frequently thought to be_____with the open countryside and home-grown food.