用被动语态完成句子
1.Chinesemadepaperfirstintheworld.
Paper-first--Chineseintheworld.
2.Whenwecook,wousepan.
Pan-cookingbyus.
3.Theyoftenaskmetodothiswork.
I-often-thiswork.
4.Whatdoyouusuallyusethismachinefor?
What-usually-?
5.Watercoversaboutthreequartersoftheearth--water.
第5句题目有错误
是:Watercoversaboutthreequartersoftheearth.
改为
Aboutthreequartersoftheearth--water.