The man over there _________ be over fifty. He looks so young.

Harry Potter and the Sorcerer’s Stone was such _____ most interesting novel that many children want to read it _____ second time.

Jack, please tell Tom to call me when he ______ back.

Is this your pen? —No, it isn’t. It’s pen.

Millie is getting on well with her friends but she is a little selfish ______. [ ]