麻烦回答一下1.Han Li has many foreign friends.( )are working in th

麻烦回答一下
1.Han Li has many foreign friends.( )are working in the same company with her.
A:Some of they B:Some of them C:Some of theirs
2.My foreign friends often help me( )my English.
A:with B:at C:for
3.The students are cleaning their classroom .Some are putting the desks in order,and( )are cleaning the windows.
A;other B:the other C:the others