Old people must be spoken to politely .为什么有to?

Old people must be spoken to p___. Old people must be spoken to politely .为什么有to? Old people must be taken good care of by us Old people must be spoken to p___.为什么用politely Old people must be spoken to ______.(礼貌) must the old people be spoken to polity 为什么用 be spoken to old people must ___A.be spoken to politely B.be spoken politely be volunteers in old people's home 作文 Old people must be skoken to politely.为什么要加TO Old people must ________(为什么是be sopen to politely 为什么要加to Don't s____ at the old people.We must be polite. Old people must ___politely A.speak to B.be spoken at C.be spoken to D.be spoken ten-year-old(s) kids must be taken good care ofRT 那个OLD 后的S该有不? Old people must( )A.be spoken to politelyB.speak to politeC.be spoken politelyD.speak to politely youngh people should be good()old people Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to old,and,young,people,looked,after,children,must,be,well连词成句!快,可能会用到被动语态