Помогите с английским,здесь пару заданий,кто что может

Exercise 1.

1.her

2. Bob's

3. My

4. Students'

5. your

6. our

7. his

8. girl's

Exercise 2.

1. has

2. are

3. has

4. were

5. am

6. have

7. had

8. is

9. were

Exercise 3.

1. some

2. any

3. some

4. any

5. no

6. some

7. some

8. no

Exercise 5.

1. could

2. couldn't

3. had to send

4. had to sign

5. might change

6. might not