3.One­third of the country is covered (cover) with trees and the majority of the citizens are (be) black people.

　　4.—Volunteering is becoming increasingly (increasing) popular in China.

　　—Yeah，people are now aware that helping others is helping themselves.

　　5.She was so absorbed (absorb) in her job that she didn’t hear someone knocking at the door.

　　6.Both students and parents appreciate the great importance schools have attached to eyesight protection.

　　7.Professor Williams keeps telling his students that the future belongs (belong) to the well­educated.

　　8.In my opinion，life in the twenty­first century is much easier than it used to be.

　　9.The country life he was used to has changed (change) greatly since 1992.

　　10.—How did he break his head while swimming?

　　—Ignoring (ignore) my warning，he dived straight into the shallow water.

　　Ⅱ.单句改错

　　1.She owes to herself to finish the work by the end of the day.owes后加上it

　　2.He forgot all about his homework completely，having absorbed in the computer games.去掉having

　　3.He didn’t turn up at last，just as expecting.expecting→expected

　　4.At arrival，they got down to the work immediately.At→On

　　5.He lay on the ground，stared into the distance.stared→staring

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