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学习目标：复习并熟练掌握本单元的基础知识及语法； 重点、难点：语法: may have/might have I. 根据所给汉语或所缺单词的首字母，写出单词的正确形式。 A ___ is the best form of defense. The giant panda will soon become e ___ . 3. She c ___ the ownership of the land. Many people are very concerned about the d___________（毁灭）of the rainforests. You must stay c _____ in case of an emergence. The search was called for the sailors who ___________(消失) in the storm. 7. The custom of arranged marriages will ____________ (存在) in many countries. 8. The knife is not ___________ (锋利) to cut the grass. 9. 70% of the __________ (表面) of the earth is covered with water. 10. The farm ____________(占面积) an area of 200 square kilometers. 11. On the other hand, it has a ___________ (积极) effect on our life. 12. A red sky at night ____________ (象征) fine weather the following day. 13. I had the good ____________ (运气) to be chosen for trip abroad. | 
