______ all our efforts, we still lost the game

A: Sorry, I didn’t return your book on time.—B: _______.

Her book is the same _____ mine, but it’s different _______ yours.

We have been trying hard to find out the ____________of the homeless man, but without luck, no one can tell who he is.

Mark was afraid of being scolded，so he________say what he thought to his parents.