她是比赛中最有才华的歌手。

She is ___by ___far the most talented singer in the competition.

在我参观过的所有城市中，巴黎是最美丽的。

Among all the cities I've visited, Paris is ___by ___far the most beautiful.

这是我参加过的最难的考试。

This is ___by ___far the hardest exam I have ever taken.