this is not,this's not,this isn't哪个正确

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• 用所给单词的正确形式完成短文too,each,think,sell,buy,feel,eat,pass,give,pay Jack and Bill are both seven years old.One day they went out to( )pies together.Before they went out,Jack's mother told Jack,"You take twelve pies,and sell them for five cents ( ).You mustn't eat them,and you mustn't ( ) any of them to othera." Bill's mother told Bill the same words.They went to town together.But after a whole morning,Bill sold only one pie.Bill ( )very hungry,but
• 平抛运动某一物体以一定的初速度水平抛出,在某1s内其速度方向与水平方向的夹角由37°变成53°,则此物体的初速度大小是多少?此物体在这1s内下落的高度是多少?[取g=10m/s²,sin37°=0.6,cos37°=0.8]设初速度为v,在其速度方向与水平方向夹角是37°的时候经过了t秒的时间①设当其速度方向与水平方向夹角是37°的时候有Lx=vtLy=1/2gt²=5t²tan37°=Ly/Lx=5t²/vt=5t/v=0.75②设当其速度方向与水平方向夹角是53的时候有LX=v（t+1）LY=1/2gt²=5（t+1）²tan37°=LX/LY=v（t+1）/5(t+1)²=v/5(t+1)=0.75则有,5t/v=0.75v/5(t+1)=0.75解得t≈1.29s,v=8.6m/s,△Ly=17.9m但是正确答案是t≈1.29,v=17.14m/s,△Ly=17.9m,我觉得我列式没有错,而且算出来两个答案都是对的啊,偏偏就初速度那错了,为什么?
• A:Is he sitting on a football?B:No,he's not.He's sitting on a basketball.可以换成No,he isn't .
• I don't know how long (Lucy will live \ lucy lived) here .let's go and ask her.填哪个,为什么
• Julia isn't here.Let's ask Linda i_______
• 请根据给出的首字母写出单词,完成句子.How often will you water the flower?O____ a month.Hmmm.It'll d____.What is it?Is it a potato?No,it isn't.It's a t____.This plant has no w____.It w____ grow.The flowers need light.Let's p____ it beside the w____
• keep sb at a distance from sb/sth 用法正确吗?还是keep at a distance with 用正确的用法造句 前者是教辅里面的 后者是百度的 我不知哪个正确keep one's distance 也造句
• It's always difficult being in a foreign country,especially if you don't know the culture of thecountry.请问being 什么成分,什么用法,我真不理解我在网上查了很多，没有it's difficult doing sth，只有 have difficult in doing sth,请问到底该怎么正确理解,有it's no use doing,no good doing等等
• Isn't your uncle an engineer?A No,he isn't B No,he is C Yes,he isn't D Yes,he does达人请进,A B C D 选哪个.为什么
• it's not a lovely day,is it?AYes,it is.BNo,it isn't.C.Yes,it does.I don't want to go out.请告诉我正确答案并说明缘由.
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• 丙三人合包一辆出租车到各自的目的地，已知从出发地到甲的目的地是从出发地到乙的目的地的5分之4，从出发地到丙的目的地是从出发地到乙的目的地的一半，且甲，丙三人正好顺路。如果包车的总费用为230元，丙三人各自应分摊多少钱？