Passive 1 (is done/was done)

Hello!
Today I started study grammar about Passive. Please, correct me :)

1. Cheese is made from milk.
2. The roof of the building was damaged in a storm a few days ago.
3. You were was invited o the wedding. Why didn't you go?
4. The cinema is a place where films are shown showed.
5. In the United States, elections for president are held every four years.
6. Originally the book was written in Spanish, and few years ago it was translated into English.
7. Although Because we were driving quite fast, we weren't overtaken by a lot of other cars.
8. You can't see the house from the road. It is surrounded by trees.
9. When was television invented?
10. When was Pluto  was discovered?
11. What is silver used for?
12. All flights were canceled because of fog.
13. This road isn't much used by people.
14. I was accused of stealing money.
15. How are languages languages are learned by people?
16. We were warned not to go out alone by somebody.
Thank you!

Nice work!

10. When was Pluto was discovered? 
15. How are languages are learned by people? 

Passive 1 (is done/was done)

Hello!
Today I started study grammar about Passive. Please, correct me :)

1. Cheese is made from milk.
2. The roof of the building was damaged in a storm a few days ago.
3. You were invited to the wedding. Why didn't you go?
4. The cinema is a place where films are shown.
5. In the United States, Presidential elections are held every four years.
6. Originally the book was written in Spanish and a few years ago,  it was translated into English.
7. Although we were driving quite fast, we weren't overtaken by many other cars.
8. You can't see the house from the road. It is surrounded by trees.
9. When was television invented?
10. When was Pluto was discovered?
11. What is silver used for?
12. All flights were canceled because of fog.
13. This road isn't  used much.
14. I was accused of stealing money.
15. How languages are learnt?
16. We were warned to go out alone.
Thank you!