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.