28. had forgotten 

29. was watching- was 

30. drove 

31. got- had gone 

32. had eaten- knew 

33. was doing- saw 

34. were you doing- came 

35. missed- had told

28) I suddenly remembered that I (forget) .............had forgotten............. my keys.
29) While Diana (watch) ......was watching......... her favourite TV programme, there (be) ......was........ a power cut.

30) Who (drive) ............drove.............. the car at the time of the accident?

31) By the time Sheila (get) .......got........... back, Chris (go) ...........had gone............... home.

32) David (eat) ........had eaten............. Japanese food before, so he (know) ............knew............... what to order.

33) I (do) .............war doing............. some shopping yesterday, when I (see) ...........saw............... your friend.

34) What ....were...... you (do)............doing.......... when I (come) ...............came............ to your office yesterday?

35) Laura (miss) ............missed.............. the party because no one (tell) ..............had told................. her about it.