英语数字翻译！英翻汉！

Question

six hundred and eleven thousand nine hundred and one
two million five hundred and two thousand three hundred thirteen
one hundred and five million six hundred and seventy-one thousand andtwo
two billion thirty-one million five hundred thousand and eighty-one

Answer 1

611,901
2,502,313
105,671,002
2,031,500,081

Answer 2

600加11901
2000500加2313
100加5000600加71002
2031500081

Answer 3

611901
2502313
105671002
2031500081

Answer 4

6110901
2502313
105671002
2031500081

Answer 5

611,901
2,502,313
105,671,002
2,031,500,081

Answer 6

应该是分开的吧