1 . He paid the boy $10 for washing ten windows, most of ___ hadn’t been cleaned for at least a year.

A．these

B．those

C．that

D．which

2 . John invited about 40 people to his wedding, most of _______are family members.

A．who

B．which

C．whom

D．what

3 . 16. The river, ______the bank are covered with trees, is very long.

A．whose

B．which

C．of which

D．which of