4. thinks; is driving
5. have; am having
6. is looking; doesn't see
7. are; are having;
8. Do you want; Yes, I do.
9. are they doing; hear; are listening
10. knows; wants to know; has; to study
11. are you reading; is; Do you want to read...? I don't know
12. are having; have
13. gets up; lives; is
14. is; is doing; is reading;
15. am writing; lives; write