单词拼写（共10小题；每空1分，满分10分）
根据所给的汉语、首字母或单词完成句子中所缺的单词，注意时态和形式适当的变化。
66.    （依靠）on science technology and knowledge is the key to increasing economic power.
67.When I got my     （硕士） degree, I wanted to return home to work for my own country.
68. If I have a chance to choose my own major, I would like to study       (应用) science.
69. Seeing the h      monster the little girl was too scared to speak a single word.
70.The       (特性)of water make the ocean such a great place to live.
71.Most animals and plants are s       to large or sudden changes in temperature, so the ocean is a safe and comfortable habitat.
72. The river water is used by the local people after being          (净化)．
73. Martin Luther King led many demonstrations to fight against racial d        in the USA.
74. I ________ (保证) that he will agree with us when he hears what we know now.
75. Experienced travelers may prefer to make their own            (arrange) instead of the advice of a travel agent.