1.Mr Green often helps those students ____he thinks are not quick at their lessons.a.whom b.who c.when d.because

1.Mr Green often helps those students ____he thinks are not quick at their lessons.a.whom b.who c.when d.because
those students 不是help的宾语吗?为什么不选a
2.The old man has two sons,____looks like him.
a.all of them b.both of them c.each of them d.neither of them
先排除一下a和b,c 和d都可以用单数形式啊,为什么答案选d而不选c?
3.____to see the film please raise the hands.
a.Those who wants b,those who want c.Any one wants d.People want
4.The reason ____being late for the meeting was _____his little son fell ill
this morning.
a.for:that b.why:that c.for:because d.why:because
5.each boy 和each of boy有什么区别?