I/ 1. are you doing/am writing/write
2. is snowing/comes
3. do you usually start/work/are working
4. Do you listen
5. rises/are travelling
6. Are you looking/need
7. wants/is saving/cost/getting
8. is riding/drives
9. are having/have
10. think/goes/agree
II/ 1. When Don arrived, we are having coffee.
2. He broke his leg when he was skiing.
3. What were you doing at this time yesterday?
4. How fast were you driving when the accident happened?
5. While Henry was walking in the mountain, he saw a bear.
6. The students were playing a game when the professor arrived.
7. Felix was phoning the fire brigade when the cooker caught fire.
8. Andy was coming out of the restaurant when he saw Jenny.
9. Anna spent a lot of money yesterday. She bought a dress which costs 100 pounds.
10. When Margaret was opening the door, the phone rang.
