Change the following sentences to Passive voice
1. The secretary opens the mail every morning.
2. A gardener is watering the flowers.
3. Jimmy walks the dogs every day.
4. Heavy rain had caused the flood.
5. Police officers were examining the evidence.
6. A spokesman gave an interview to the reporters.
7. A guide will take you to your seat.
8. We are going to announce the results on Friday.
9. The new manager has made some changes.
10. The students are making arrangements for the party.
11. They clean the windows every week.
12. They had invited him to the cinema.