my report on beijing 为什么介词要用on

my report on beijing 为什么介词要用on Why did you decide on Beijing for vacation?为什么用介词on 英语翻译My Report on Beijing Hi!I'm Kangkang.My granny has lived A mile further on.为什么要用介词on on a cold night为什么要用介词on on rainy days 为什么介词要用on而不是in? on the telephone 介词为什么用on 为什么介词用on?  I weite a report on children's vacation 中,为什么要用【on】? I'll take care of it on my lunch break.为什么用介词on My uncle sometimes( )(fly)to Beijing on business.填上介词或副词 Loo in his car和on my bike介词为什么不同