Ⅵ、单词拼写(每题1分,满分10分)。
76. She had difficulty ___(发表) a speech before a large audience.
77. Tony got praise from his teacher  today， for he usually               （表现） himself at school.
78.They are all a________ workers who will be awarded for their hard work.
79.Free medical treatment kept him alive t      another year.
80.So far,since our research has not produced any answer to this problem,we need to
use a different a      to it.
81.Only when Jim made a call to say they'd already arrived safely did I feel at      (放松).
82.The earthquake left thousands of people h____.
83.The jacket was r ____ from 100 dollars to 75 dollars.
84.We must not rely on imports but on ___（出口产品）.
85.V ____  goods are on show at Christmas in western countries.