1 . There are many clowns in the playground, some of ________ are performing opera. (用适当的词填空)

2 . These terraces also provide a perfect environment for birds and fish, some of ________ feed on insects that can harm the rice crops.

A．them

B．what

C．whose

D．which

3 . Many young people, most of ________ are well-educated, are struggling to find a job after graduation.（用适当的词填空）

4 . These terraces were built by the local Zhuang and Yao people, to ________ Guangxi is home. （用适当的词填空）

5 . The course about Chinese food attracts over 100 students per year, ________ up to half are from overseas.

A．among which

B．for whom

C．with whose

D．of whom