English grammar in use, unit 43 passive 2, 43.1

1. The situation is serious. Something must be done before it's too late.
2. I haven't received the letter yet. It might have been sent to the wrong address.
3. A decision will not be made until the next meeting.
4. These documents are important. They should always be kept in a safe place.
5. This road is in bad condition. It should be repaired.
6. Be quiet! The announcement is about to be made.
7. The keys were forgotten in the car a long time ago.
8. The injured man couldn't walk and had to be carried.
9. If you hadn't shouted at the policeman, you wouldn't have been arrested.
10. I'm not sure what time I'll arrive tomorrow. I may be delayed.
11. It's not certain how the fire started. It might have been caused by an electrical fault.
12. A new school is being built. The old one is going to be knocked down.
13. The election is next Sunday. The full results will be known on Tuesday.
14. Last week, they weren't speaking to one another. Now they're happy again. The problem seems to have been repaired.