Ответ:

task 1

1. my

2. her

3. yours

4. his

5. ours

task 2

1. theirs

2. its

3. hers

4. your

5. ours

6. my

task 3

1. Emma's book

2. men's cars

3. dogs' tails

4. Tom's jacket

5. teacher's desk

6. children's bags