1.made/had

2.have left

3.has watched

4.was having

5.played/threw

6.looked/have found

7.saw/did

8.saw/was painting

9.arrived/waited/wore/looked

10.have found/digged

11.opened/heard

12.built/was

13.am wondering

1. I was making a cake when the light went out.

2. I didn't want to meet Paul so when he went into the room I had left

3.He was watching TV when the phone rang.

4.When i arrived,she have had dinner.

5. He was playing the guitar outside her house when someone opened the window and threw out a bucket of water.

6 When I looked for my passport I was finding this old photograph.

7. You looked very busy when Isaw you last night. What were you doing?

8.When I saw ,he has painted a picture.

9.When I arrived at the station,Mary was waiting for me.She was wearing a blue dress and looking very pretty.

10. I found this ring as I was digging in the garden.

11. The burglar was opening the safe when he heard footsteps.

12. They were building that bridge when I was there last year, they haven't finished it yet.

13. while I have wondered whether to buy the dress or not.