Does this book belong to ______?      

We carefully compared the result of the first experiment with_______ of the second one.

—Don't be angry with your kid when he makes a mistake again, will you? —No. I won't. I know that ______of us are perfect after all.

——What’s _________ favourite sport?—— Pingpong.

— Mary, can you take good care of ________ while I’m not at home?— Of course, I can.