请教几道PP语法题??

galfield

PP test 2
109.The chief (character) or hero (of piece) of fiction or (drama) is (known as) the protagonist. 答案B, 怎么改呢? 这里fiction , drama为什么不用复数呢?

137. Working (by) chemical reaction, and being (independence) of atmospheric oxygen, rockets are used (to power) interplanetary (space) vehicles.
答案B. 应该怎么改呢? of 前不是应该用名词吗?

chipmunk

137. -->independent. 'Being' should be followed by adj. I think it omits something after 'independent'.

ehw

109. a piece of

teddy-bear

in piece of

yongchou

hero of
>>fiction , drama为什么不用复数呢
a glass of water, a piece of paper........

being of
>>of 前不是应该用名词吗?
I'm fond of playing piano.
The parants are proud of their son.    ........
...." fond", "proud" are both adj.