帮忙做几道连词成句。答:1.they,their,are,going,stay,to,at,mother's.They are going to stay at their mother's.2.did,your,what,teacher,to,say,him?What did your teacher say to him?3.Tom,last,did,do,not,homework,night,his.Tom did not do his homework last night.4.runners,two,were,just,him,behind...