Câu 1
1. To swim here is dangerous
-> It is dangerous to swim here
2. Singing karaoke is easy
-> It is easy to sing karaoke
3. Mary is glad. She gets good marks
-> Mary is glad to t get good marks
4. Jane is happy. She wins the competition again
-> Jane is happy to win the competition again
5. The workers clean the streets every day
-> The streets are ckeanes every day by the workers
6. Somebody locks the gates at 6.30 p.m
-> The gates is locked at 6.30 pm
7. We should use cloth bags instead of plastic bags
-> Cloth bags should be used instead of plastic bags
8. People can recycle tires to make pipes or floor coverings
-> Tires can be recycled to make pipes or floor coverings
9. They will know the result next week
-> The result will be known next week
10. They built this bridge in 2014
-> This bridge was built in 2014