Whose is this?

1. The teacher asks up to 10 students to lend him something: a scarf, a pair of gloves, 2 books, a bag, pen, shoe, etc. He then chooses 1 or 2 objects and asks Whose is this? or Whose are these?
2. To control the answering, the teacher can point at or name the student he wants to answer the question, producing (depending on the situation): It's mine. They're mine. It's Anna's. They're hers. It's his. It's theirs.
3. After 1 or 2 questions a student can take over the teacher's role.