1) since, since, for, for, for, since, since
2) 2. I have had this watch for two years.
3. She has been in her room since7.30.
4. Dad had driven this car since January 2010.
5. I have known you for a year.
6. Mike hasn't seen Kate since Tuesday.
3) How long have you known your best friend?
How long have you been at this school?
How long your parents have owned a computer?
How long has your friend had the same haircut?
4) have just spilled; has just had; has just passed; have just fallen; has just walked; has just seen; has just eaten
5) (2) I have.
(3)Have you ever been there?
(4)went
(5)When did you go?
(6)lived
(7)Did you like
(8) I did.
6) for, for, since, ever