Question

It's almost inpossible for __few people to do___much work in__ a short time 填so或者such

加上理由

Answer 1

It's almost inpossible for _so_few people to do_so__much work in_such_ a short time

理由：
比较so和 such
其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so是副词，只能修饰形容词或副词。so 还可与表示数量的形容词many，few，much， little连用，形成固定搭配。
so + adj. such + a(n) + n.
so + adj. + a(n) + n. such + n. (pl.)
so + adj. + n. (pl.) such +n. (pl.)
so + adj. + n. [不可数] such +n. [不可数]

so foolish such a fool
so nice a flower such a nice flower
so many/ few flowers such nice flowers
so much/little money. such rapid progress
so many people such a lot of people

so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。
so…that与such…that之间的转换既为 so与such之间的转换。

Answer 2

such so such

Answer 3

such, so , such
such 一般修饰名词，so 一般修饰形容词

Answer 4

such;so;such

Answer 5

such few people 如此少的人，so much work 这么多的工作，such不能修饰many或much，in such a short time 在这么短的时间内。so+形容词+a/an+可数名词单数，such+（a/an）+形容词+名词。