C. Use Past Continuous Passive.
1. Five blocks of flats ... (build) for the last year in our region.
2. When we came, the pool... (fill) with water.
3. When I entered the room, the new people ... (instruct) what to do.
4. At 5 o’clock the students ... still... (examine).
5. When I entered the kitchen my favourite dish ... (cook).​