The umbrella is used ______ us away from the rain.[ ]

After reading for an hour, you’d better_______ the green trees for a minute or two.

Excuse me, is there ______ book by Mo Yan? -Yes. It’s on ______ bookshelf over there.

See? Only ten dollars for such a nice tie?——OK,_____.

“Frog”, Mo Yan’s latest novel（小说）, please! — Sorry, it ________ just now. But it will come out again soon.