1-C. Well, it's hard to decide.Well, it's hard to decide.
まあ、(形式主語:それは)、難しいです、決めるのはダヨ。
2-C. I was happy, because I'd worked so hard to make this happen.I was happy, because I'd worked so hard to make this happen.
私は、幸せでした、なぜなら、私は、とても懸命に働いて、これを実現することができたから。
3-C. (1) No, it's hard.(1) No, it's hard.
(1)いいえ、それは難しいです。
4-C. M: Isn't it hard?M: Isn't it hard?
M:それは、ハードではないですか?
5-C. (2) How readers must work hard to comprehend fiction(2) How readers must work hard to comprehend fiction
(2)どのように、読者は懸命に努力しなければならないのか、小説を理解するためにダヨ
6-C. He really liked the job and worked hard developing his own special techniques.He really liked the job and worked hard developing his own special techniques.
彼は、本当にその仕事が好きです、さらに、懸命に働きました、彼自身の特別な技術を開発してダヨ。
7-C. I'm a cheerful person who studies hard on weekdays, but enjoys the weekends.I'm a cheerful person who studies hard on weekdays, but enjoys the weekends.
私は、陽気な人間です、それで、一所懸命勉強しますダヨ、平日はダヨ、でも、週末を楽しんでいます。
8-C. (1) I don't regret that I studied very hard.(1) I don't regret that I studied very hard.
(1)私は、後悔していません、私が、一生懸命勉強したことをダヨ。
9-C. Everybody knows you really worked hard this year.Everybody knows you really worked hard this year.
全員が、知っています、あなたが、本当に懸命に働いたとダヨ、今年ダヨ。
10-C. Even if immigrants work very hard in their new country, they might find it difficult to adapt themselves to the new culture.Even if immigrants work very hard in their new country, they might find it difficult to adapt themselves to the new culture.
11-C. Therefore, the reader has to try harder to understand subtle points and complexities of the characters' thoughts.Therefore, the reader has to try harder to understand subtle points and complexities of the characters' thoughts.