Here are the sentences with the correct passive forms of the verbs in brackets:

1. America **was discovered** by Christopher Columbus.
2. Sydney Opera House in Australia **was finished** in 1973.
3. The Great Wall in China **was built** many centuries ago.
4. The Golden Gate Bridge in San Francisco **was completed** in 1937.
5. Burj Khalifa in Dubai, the highest building in the world, **was opened** in 2010.
6. A painting by Picasso **was sold** for 3 million dollars last year.
7. The Japanese Covered Bridge in Hoi An **was built** in the 16th century.
8. The Imperial Academy **is considered** the first university in Viet Nam.
9. The site for Huong Pagoda **was discovered** about 2000 years ago.
10. One-Pillar Pagoda in Ha Noi **was completed** in 1049.