8. While Diana(watch) her favorite program, there
(be) a power cut.
9. Who
(drive) the car at the time of the accident?
10I ...(do) some shopping yesterday when I
(see) that Dutch friend of yours
11. What exactly
(you/do) when I
(come) into your office yesterday?
12. While I
(try) to get my car started, a man
(offer) to help me
13. Although it rained a lot, I
(enjoy) my holiday
last year
14. I
(phone) you yesterday but you
(not answer). What
(you/do)?

Explanation:

8.While Diana was watching her favourite program, there was a power cut.

9.Who was driving the car at the time of the accident?

10.I was doing some shopping yesterday when i saw that Dutch friend of yours.

11.What exactly were you doing when I came into your office yesterday?

12.While I was trying to get my car started, a man offered to help me.

13.Although it rained a lot, I enjoyed my holiday

14.I phoned you yesterday but you did not answer. What were you doing?