1. My parents are very busy. They spend a lot of time taking care of us. (although)
My parents................................................very busy.
2. He said to her, “My parents are proud of my good marks this year." (told)
Не....................................... year 
3. The air in the city is not pure, so we are not healthy.(would)
- We............................................ pure
4. The monitor made no comment on the situation. He was appointed just last week. (who)
The monitor........................................... on thesituation.
5. Everyone has to wear safety helmets at all times. (be)
Safety helmets.............................................................at all times.