—Shall I wait here for three hours?—Yes. Three hours ______for you to wait for such a doctor. 

Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.

——You don’t go to that cinema quite often, do you? —— No, I only go there ______ because it’s too far away from my house.

His photos appeared ______ in national famous magazine at that time.    

Bob is ________crazy about Beethoven that he knows all his works well.