Choose the best anwser

6. A man bought in a little girl, ______ hand was cut by flying glass.
A. whose
B. where
C. who
D. that
8. He paid me $5 for cleaning ten windows, most of _______ hadn’t been cleaned for at least a year.
A. who
B. that
C. whom
D. which 
10. The chair in _____ I was sitting suddenly collapsed.
A. which
B. where
C. whom
D. that