people would pick up handfuls of gravel from the bottom of the stream,handfuls前面为什么不加a

people would pick up handfuls of gravel from the bottom of the stream,handfuls前面为什么不加a 英语 请问能这么修改吗?The platform would rise up and down alongside a skyscraper and pick up people trapped in high stories改为（增加了：who are ）：The platform would rise up and down alongside a skyscraper and pick up people 【w pick up pick up pick up Why do some young people pick up smoking?怎么翻译 People try to pick up apples from water ___their teeth Jack said he ____ this Sunday morning.A.would pick up me B.picked me up C.would pick me up D.picked up me people would pick up handfils of gravel from the bottom of the streams人们常常从河底捡起一把一把的砾石.这里would可以改成often或usually吗?为什么 pick out;pick up;pick over区别 pick them up还是 pick up them pick up him还是pick him up pick out,pick up,pick at,pick on区别? pick at pick from pick up pick out There is some litter there.Would you mind pick () up?填them还是it 翻译would you please send someone[laundry bag] to pick up my laundry? please confirm whether you would like someone to pick you up He would always foot the bill, and pick up the tab. 帮翻译一,谢谢.