Ответ:

2. It's Anne's car

3. I was at Elena's house last night

4. All the stidents' books are on the table

5. The 28th of June is my sister's birthday

6. Mrs Penn's cakes are delicious

7. My grandparents' house is next door to ours.

8. Jenny and Mark are Chris's parents

2. The computer games are Alan's

3. The books are Alan's

4.The ball is Mike's

5. The chocolate is Mike's

6. The running shoes are Alan's

7. The guitar is Alan's

8. The magazine is Mike's