A: I'm sorry. I've lost the magazine I borrowed from you.
B: ( ).
A: I guess I'd better not. I don't want to let it happen again.
B: Don't worry. I've already finished it.
That's all right. I don't want it.
It doesn't matter. Would you like to take this new issue?
Never mind! It's no use crying over spilt milk.
That was very careless of you. You should have been more careful.