用括号中所给单词的适当形式填空,使句子完整、通顺.
12.Thanksfor______(sweep)thefloorforme,Tom.
13.It’stoodifficult.Ican’tfinishthework______(without)yourhelp.
14.Wecelebrate______(nation)DayonOctober1everyyear.
15.Alotof______(visit)cametoourschoolyesterday.
16.Thestudentsarehavinga______(meet)ontheplayground.
17.______(luck),theboywasnotbadlyhurtintheaccident.
18.Hisparentsarestill______(alive),buthediedtwoyearsago.
19.Tina’sfatherisacomputer______(program),andhehasalotofworktodoeveryday.
20.ChinahasbuiltanewGreatWallacrossthe______(north)partofthecountry.
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