1. Of the housands of names the computer program presented, Citgo was chosen.

어떻게 해석해야하나요? ㅜㅜ
저 밑줄친 부분에서 of 앞에 생략된 명사는 Citgo 인지요....?

2. If anything, research suggests that forcing children to repeat a grade hurt them.

역시나 밑줄친 부분 때문에... ㅜㅜ 어찌 해석해야할지....

3. The call to end social promotion may have a nice ring to it in political speeches.

전혀 본적 없는 표현인데 무슨 뜻일까요?