There's a hundred million just like her这里just是什么意思?起什么作用?是什么词性那在这句子中，去掉just也是可以的吧？

There are ( three hundred and sixty-five )days in a year.hundred后面不应该加s吗? There are over nineteen_students in Sonia's school. A.hundred B.hundreds C.hundred of D.hundreds of 32 .There’s more than _ books on the shelf A hundreds of B hundred C .hundred of D .a hundred 12.There’s on the table.Do you know whose it is?A.a one-hundred-yuan-note B.a one-hundred yuan note C.a one-hundred-yuans note D.a one-hundred-yuan note There were more than a hundred people at Kate's birthday party.How come she （）——How many pages are there in the book?-----________.（选择答案看问题补充）A.It's two hundred.B.There is two hundred.C.There are hundred. There are only ( ) students.a.nine hundred b.There are only ( ) students.a.nine hundred b.nine hundred of last year -----of new books were.a,the hundred b,hundred s c,one hundred there were two________(hundred)people at yesterday ’s meeting there are hundred of students on the piayground ,hundred要不要加s? 当hundred前有a时加不加s It's about a hundred 怎么提问 It's only ____________ from here to the building.A a hundred foot awayB a hundred feet awayC a hundred's foot awayD a hundred's feet away several hundred 中的hundred 后要加s several hundred 的形式是不是和a few hundred two hundred 的一样不需要加上s There are ____ trees in our school.A.hundred of B.five hundreds C.five hundred of D.five hundred There are（）students in the hall.hundred of a hundred of hundreds of There are five_____students in our school.A.hundreds of B.hundreds C.hundred D.hundred of THERE IS A FIRST HUNDRED METRE RACE[改错]