John’s success has nothing to do with good luck. It is years of hard work______ has made him what he is today. (2011 .湖南)
______ at the door before you enter my room, please.
Our friendship ______ quickly over the weeks that followed.
-Have you heard about that fire in the market? -Yes, fortunately no one ______.
Many people have donated that type of blood; however, the blood bank needs ______.
______ with care, one tin will last for six weeks.