Ⅳ 单词拼写（每小题0.5分，满分5分）
请根据句子的逻辑含义，用模块四课本中的恰当的词的正确形式填空，并把完整的单词写在第二卷相应的空格上
76. The official made no c_________ on this issue. Instead, he kept silent in order not to get into trouble.
77. MIT stands for Massachusetts I__________ of Technology, which is well-known both in the U.S. and throughout the world for its high quality education.
78. We are so pleased that the summer holiday is a________. Do you have any plan for it?
79. Every one is u________ as we can’t possibly find two same persons in the world.
80. The factory has decided to introduce more a__________ technologies to improve both the quality and quantity of its products.
