81. It is kind of you to help us handle this tough problem in your spare time because it is very difficult for us to think of a means as effective (effect) as yours.
你能在业余时间帮助我们解决这个棘手的问题真是太好了，因为我们很难想到和你一样行之有效的办法。
82. As is known (know) to all, ten is twice as much as five while one hundred is nine times more than ten. One plus one is equal to two, while two minus one is one. Three multiplied ( multiply) by two is six, and six divided by two is three.
众所周知，10是5的两倍，而100又是10的十倍。一加一等于二，而二减一得一 。三乘而得六，六除二得三
83. No matter what her parents said, the spoiled(spoil) girl still had faith in whatever her thoughtful boyfriend told her about the jungle and wanted to take an adventure with him.
无论她父母怎么说，这个被宠坏的女孩仍相信她男友告诉她的关于那个奇特丛林的一切，并。想和他一起去探险。
84. At last, the leader drew the conclusion(conclude) that he preferred(prefer) to run a risk of developing new products rather than go on producing the products that can’t meet the demands of the new market.
最后，领导得出理论：他宁可冒险开发新产品也不愿意继续生产这些无法满足市场需要的产品。
85. The shy waitress apologized (apology)to me for making a mistake after she charged me 100 yuan for just one tin of coke.
害羞的服务员因为一听可乐收了我100元的错误而向我道歉。
86. Is it convenient (convenience) for you to exchange your newspaper for this newly published magazine with me so that we can share the information ( inform)?
你现在方便把你的报纸和这本新出的杂志交换下，以便我们共享一下信息吗？
87. Child as/though he is, he has known that the more exposed (expose) he is to financial issues, and the younger he becomes aware of them, the more likely he is to become a responsible(response), forward-planning adult who can manage his finances confidently and effectively.
尽管他是个孩子，却已经知道越多接触财务问题，越早意识到它们的存在，他就越有可能成为一个有责任心、有前瞻性的成年人，能自信有效地处理财务问题。
88. Despite the fact that many fans have waited outside the gate of the booking office, many of them will still be told that the tickets are available only to the first 100 people free of charge.
尽管许多粉丝在售票厅前等了很久，但他们中的绝大部分仍将被告知只有前100人能免费拿到门票。
89. Because the class teacher typed(type) too slowly and didn’t know how to input the chart into the computer, she had the important file scanned(scan) into the computer and printed out after she corrected some spelling (spell) mistakes.
由于班主任打字速度太慢而且不知道该如何将图表输入电脑，她在纠正了一些拼写错误之后找人把这份重要的文件扫描进电脑并打印出来。
90. However enormous the difficulty we are faced with, we will have no choice but to unite(unite) and overcome it.
无论我们面对多大的困难，我们只能团结起来克服它。
