3 How many passive sentences can you make? (Your sentences can be positive or negative.)

Millions of pizzas are made every day.
The World Cup was built fifty years ago.
How many emails are sent to me by mistake?
Our house was built two years ago.
America was discovered in 1492.
This email is used every four years.
My computer was bought last night.
How many songs are played in China?
This book is written by a famous author.