It’s a secret between us. Don’t tell anybody. —Sure, ______________.

Have you returned the book to the library _______ —Yes, I have _______ retuned it.

It______ we had stayed together for a couple of weeks______ I found we had a lot in common.

For _____ information about present national boundaries, wed better refer to an up-to-date map.

下面加点实词的解释有误的一项是（　　）