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

Mr. Li will go to Guangzhou by air. His workmates are at the airport.

It is not how much money you will give usbut that you are present at the ceremony ______ really matters

You can see the stars on a clear night, but in the daytime they are ________.[ ]

Having retired, he ________ the club for old men and played chess every day there.[ ]