3x加2y减三等于零，求27的x次方乘以九的y次方的值。

情问：I don't know --------怎么填?（A.he is how old B.is he how old C.how old is he D.how old he is)能说一下相应的语法知识,并举一个例子吗? i don't know () to () the question.(每空填一词） （）（） our classes at 8:00 a.m.(每空填一词） their neighbours usually give them a treat of some candy.同义句要求3个同义句,我初一水平,别写太深奥了,好的++分可能是+5分10分都可能,看看好不好 上课回答问题的勇气300字作文 fast not good for food you is 日本咖啡厅里的“女仆拿铁”是什么意思啊 What ------- we do when we are in school?一个单词 Kiss Ever Never Teach! life is like a boat 这句英语错误没? ——What's the 100—meter race r____ in our school?——Maybe 12 sceonds. —What‘s the 100-metre race r___ in your school?—Ten seconds. 推油是什么样的 舒服吗 大家给我讲下 第一次的经历好吗 释迦摩尼有后人吗书上说释迦摩尼出家前已经有儿子了 但好像没有哪部史料记载其子及其后裔的命运 英语翻译1 she always complains that there is nobody living near that she can take to2 he is not the easiest man to win over ,he will need some taking round3 whatever their technical knowledge may be ,adult students have a good deal of practical e sealtest fat free skim milk的热量是多少? low fat milk意思WHOLE GRAINS AND LOW FAT MILK 97% fat free,一种冰淇淋,是热量低的意思？free的含义是？ 24 fat free thin 在芝士的包装上. 英语翻译 after work,my mother( )(fell)very tired His mother_____usually very tired after work.His mother_____usually very tired after work.a)is b)has c)does d)likes l feel very tired after the hardly work of all these years这句话哪里错了 英语翻译不好意思...确实有错的...正确的是the greatest sweetener of human life is friendship.To raise this to the highest pitch of enjoy ment is a secret which but few discover 如何加强海洋防灾减灾能力建设 would you like black coffee or white coffee.oh I_____black coffee betterA prefer B like C have D practice 译We were having a party while my neighbour is sleeping. 功的原理及应用 OLDTOWN WHITE COFFEE怎么样 MOQ,MPQ ,L/T 英语翻译谁要来看樱花 这句话 翻译的越简洁越好 谁要来看樱花 OLDTOWN WHITE COFFEE SUNWAY MENTARI怎么样 I wish I___with her.A.would be B.am C.was D.were我选的是A,正确答案是D,为什么,