difficult to fall asleep again after waking up.

　　参考答案

　　61. that

　　62. of/about

　　63.an

　　64. especially

　　65.to fall

　　66.fixed

　　67. following

　　68.sleepy

　　69.where/in which

　　70. it

　　【语法填空】Explore MKII

　　    MKII, a planet billions of kilometers away, is the origin of life in many religions. Physicists ___1__ (prove) the theory that its gentle climate and the pull of its gravity are similar to the earth’s. And astronomers have found that oxygen atoms and carbon dioxide, ___2__ are fundamental to life, exist in __3___ atmosphere through satellites. Cheered up __4___ this news, biologists, in their turn, began to do some research to remove people’s puzzles—Now that there are some suitable conditions, does life really exist on this globe? Do they multiply by laying eggs __5___ giving birth to babies?

　　Last month, __6___ spaceship was sent there. It’s a pity __7___ this mission failed. Unlike the earth, MKII is a much __8___ (young) planet. Thus, masses of harmful acid clouds float everywhere __9___ (cause) violent chain reactions to break out. These clouds not only blocked out the pilots’ sight but also damaged the engine system. __10__ (luck), the pilots watched out carefully and prevented the spaceship from crashing in time.

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