What are they busy 后用加doing吗?（Wat are they busy doing?)

What are they busy 后用加doing吗?（Wat are they busy doing?) What are you busy ______? what are you busy yeatertay? the doctors are busy doing what they can to save dying man,这个句子对吗,为什么 what busy people they are改haw_ those peiple _空应该填什么 What.are.you busy.( I.What.are.you busy.( I.am.busy.( )my.homework. they are busy ----------model planes 填词 They are v-- busy(忙） They are busy p______ using computers now what are you busy ( ) i'm busy ( )my homework what are you busy是否正确. great!what's ______?are you busy? What are you busy ____(do). The doctors are busy doing what they can _____ the dying man.为什么是C.to save 是They are all busy and happy 还是They are all happy and busy? what are they What are they? What are they doing?