1 . Previously, water quality in the Li River had suffered greatly from an increasing volume of tourists, many of _________ frequently threw garbage into the river. (用适当的词填空)

2 . The settlement is home to nearly 1, 000 people, many of ______ left their village homes for a better life in the city. (用适当的词填空)

3 . The old lady has two daughters, one of ________ is working abroad. (用适当的词填空)

4 . In our class there are 46 students,   ______ half wear glasses.

A．in whom

B．in them

C．of whom

D．of them

5 . Soon children in the camp had many new friends, ________ they shared food, stories, and projects.

A．for which	B．with whom
C．of which	D．to whom

6 . We all like our English teacher, ________ we have learned a lot.

A．that

B．whom

C．who

D．from whom

7 . Barack Obama delivered a speech to 500 local youths during his visit to China，many of     were from Fudan University and Tongji University．

A．them

B．whom

C．which

D．those