Chủ đề:
TEST YOURSELF 1 : Unit 14Câu hỏi:
Change these sentences to advanced passive:
1. It's known that there were early human settlements near natural salt deposts.
=>There ........................................................................... near natural salt deposits.
2. A thoundsand years ago, salt was thought to be as valuable as gold.
=> A thousand years ago, it...................................... as valuable as gold.