【初二英语】选词填空 请说明理由

as soon as 一到家就发邮件给我
untill 让我们发邮件吧，直到下次再见面
when 什么时候能回中 国
before 强调见面之前，已经是笔友了
after 参观游玩以后，对 China了解更多了
while 边玩边学，进行时用while

1 mother always prepare supper（ before ）I come back from school
2 I can go with you ( after ) I finish the homework
3 ( As soon as ) I do not feel well,I always go to see the doctor
4( While ) september comes ,it starts to get cooler
5 ( While )it is 12 O'clock ,everone shouts very loudly
6 it's the last day (when )the new school year begins

as soon as~~~~~~~到家之后立即发电邮，时间的紧迫
until~~~~~````下次见面之前都要互发电邮
when~~~~~何时返回中国，强调一个时间
before~~~~在见面之前，是笔友，事有先后~
after~~~~~来中国之后了解更多，意思上就可以看出
while~~~~强调同时发生，到访中国期间学了不少中文