用括号中所给单词的适当形式填空。
小题1:Peter is a kind and ____________ (help) boy, and we all like him.
小题2:Excuse me, can I give me two ____________ (knife).
小题3:Daniel’s birthday is on the____________ (nine) of March.
小题4:Thanks for ____________ (invite) me to the party.
小题5:Look, there are so many ____________ (policeman) over there.
小题6:It’s ____________ (luck) to live in a community like that.
小题7:Do you want to do some ____________ (shop) with me this afternoon?
小题8:He will ask someone ____________ (fix) your bicycle. It doesn’t work.
小题9:My flat is on the ____________ (twelve) floor in that tall building.
小题10:This is my ____________(three) day in Russia.
小题1:helpful.
小题2:knives
小题3:ninth.
小题4:inviting.
小题5:policemen
小题6:lucky.
小题7:shopping.
小题8:to fix
小题9:twelfth
小题10:second
题目分析：
小题1:句意：彼得是一个善良而乐于助人的男孩，我们都喜欢他。有帮助的，形容词，故填helpful.
小题2:句意：你能给我两把小刀吗。以f或fe 结尾的名词变复数，用ves代替就可以。故填knives
小题3:句意：Daniel的生日在三月九日。序数词表示日期。第九，在基数词的基础上，去e加th,故填ninth.
小题4:句意：谢谢邀请我参加你的聚会。for介词，后加名词或动名词。故填inviting.
小题5:句意：看那边有那么多的警察。policman,变复数，把man 改为men，故填policemen.
小题6:it is +adj+to do sth ,it代替动词不定式做形式主语。luck的形容词：lucky.故填lucky.
小题7:去购物，do some shopping,故填shopping.
小题8:ask sb to do sth ,要求某人去做某事，故填to fix.
小题9:我的公寓在那个高大建筑物的第十二层楼上。序数词，第十二，故填twelfth
小题10:句意：这是我在俄罗斯的第三天。序数词，第三，故填second