I don"t regret ______ her what I thought about her proposal, even if it upset her.

Most of the retired people are happy ______ their quiet...

单项选择题Most of the retired people are happy ______ their quiet life in the country-side.

My brother lent me many reference books, but ______ of ...

单项选择题My brother lent me many reference books, but ______ of them was of any use for my report.