Question

ア

文法問題
意味が通るように一語取り除く問題です。それぞれどの単語ですか？お願いします。

For my own part, speaking personally, I have found the happiness of
parenthood greater than any other that I have experienced.
I believe that
when circumstances lead men or women to go without this happiness, a very
deep need for remains unfulfilled, and that this produces dissatisfaction and
anxiety the cause of which may remain quite unknown.

Some of the greatest advances in science have come about because
some clever person saw a connection between a subject that was already
understood, and another noticed still mysterious subject.

Answer 1

taka

一語取り除く問題です。それぞれどの単語ですか？ → それは、…, a very deep need for remains unfulfilled,…. の for です。　
【構文】…, a very deep need(S) remains(V) unfulfilled(C),….
For my own part, speaking personally, I have found the happiness of parenthood greater than any other that I have experienced. I believe [that <when circumstances lead men or women to go without this happiness>, a very deep need remains unfulfilled, and that this produces dissatisfaction and anxiety <the cause of which may remain quite unknown>].
私自身について言えば、親になることの幸せは、私が今まで経験した他のどんな幸せよりも大きいと感じています。[＜状況によって男性または女性がこの幸せを得られない時＞、非常に深い欲求が満たされず、そしてこのことが、＜その原因が全く分からないまま＞不満と不安を生じさせると]私は信じています。

参考にしてください。