They __the train until it ````是saw or watched?用法什么区别?

They __the train until it ````是saw or watched?用法什么区别? Look!They are __the music. they were waiting to buy tickets __the last train横线处介词是用 in /to/ with/ on的哪一个 为什么 they were waiting to buy tickets __the last train横线处介词是用 for /to/ with/ of的哪一个 为什么 I__ __the train to my uncle's last summer. The train is ready.The people began __the train.A to get on B getting on They went there by train.(对by train提问） They Dont Care About Us 怎么读请用中文注释they:[ ðei; ðe ] don't:[ dəunt ]care:[ kɛə ]about:[ 'əbaut ]us:[ us ] look,they are getting up the train. They travelled by train 【改为否定句】 They are takeing the train every day They were hurrying to catch their train.They were ___ ___ ___ catch their train They were hurrying to catch their train.They were ___ ___ ___ to catch their train They usually go there on a train.They usually ( )a train ( )( ).要原因! train train train They are __the school basketball team.a.between b.of c.at d.on选什么