Whatever you have found，you should give it back to whomever it ________

There ________ some bottles on the table and there ______some milk in them.

Experts think that ____ recently discovered paintingmay be ____ Picasso

But for his help, we wouldn’t have succeeded. So we ______ his timely aid. [ ]

Men and women can ________ people from all over the world by sending and receiving electronic mail.