All of them are b_______doing their homework now.填什么词

they are my friends b___ of them are clever 是all of them are 还是 all of they are either of them is /all of them are一样吗 All of they还是All of them are my friends. all of them are in nice boxes,为什么是them All of them,Are the love you are given me. All of them are young pioneers为什么要加of? You are none of them .Becase you are all of them. these measures are very b___,you'd better take them. 参加比赛,英语怎么说?All of them are 参加比赛? All of them are Young Pioneers的意思 All of them are our friends 的同义句 All.of.them.are.the.love.you've. 什么意思 All of them are from America相当于They ()()from America All of them are playing football.=_________are________playingfootball. All of them are American?这句话错在哪里? ALL of them are old teachers哪个是谓语? all of them是什么意思