单词填空（共15小题；每小题1分，满分15分） 71.  I lost my _______ (平衡) and fell on my face. 72.  You must _________ (道歉) to your sister for being so rude. 73.   The robber was _________ (观察)entering the bank. 74.  On the _________ (相反)，the job was fascinating. I love it. 75.  What she said _________ (使信服)me that I was mistaken. 76.  He is not _________ (可能) to succeed. 77.  His arms _________ (摇摆) as he walked. 78.  It was _________ (考虑周到) of you not to play the piano while I was having a sleep. 79.  Some of the violent _________ (场面) are very frightening. 80.  Not much _________ (解释) will be needed. 81.  A postman is a man _________ (递送) letters and parcels. 82.  I prefer to live in a house _________ (包围) with trees and flowers. 83.  The criminal escaped over the _________ (国界). 84.  She has _________ (主演) in a variety of films. 85.  I don’t go along with her _________ (宗教上的) beliefs?