(2014·宁波一模) The headmaster has retired but no one knows who will________him in the post.

Why don’t you put the meat in the fridge ? It will _____ fresh for several days. 

—Dad, I don’t think Oliver the right sort of person for the job.—I see. I’ll go right away and ________.

Hundreds of Swedish workers are trialing a six—hour working day in the hopes that it will_____ sick leave and save the country money.

Since you are always working hard at your lessons, your efforts will ________.