五道初三英语词转题.
根据所给内容,用其正确形式填空.(求详细解析!)
TheGrandCanyonisoneofthegreatest ________(nature) wondersoftheworld.
It'samazingthatthebabyisstill _______(live) intheaccident!
Duringthisyear,welearnedalotof_______(knowledge) fromtheteachers.
Infact,therearemany_______(difference) between thetwinbrothersalthoughtheylookthesame.
Youshouldgiveup________(smoke) becauseithasdonegreatharmtoyourhealth.
附1-3题答案:1.natural(为何这样变形?)2.alive3.knowledge(为何不变复数?)
4、5两题我对老师给我的答案存疑,附:4.differentes5.smorking
不只求答案,更求大神的解析!