Ex. 10

3. It is ours.

4. They are his.

5. It is yours.

6. They are theirs.

Ex. 11

2. B

3. A

4. B

5. C

6. B

7. A

8. B

9. C

10. C

Ex. 12

1. There is an elephant in the garden.

2. It's his.

3. There are wolves in the forests.

4. There is some bread on the table.

5. There is some money in my pocket.

6. They go to school every day.

7. My bicycle has got two wheels.

8. She's got a book.