1. We were having lunch when the rain started. — We were notweren't having lunch when the rain started.
2. Did you work yesterday? — Did notDidn't you work yesterday?
3. My father had already gone to cut the grass. — My father hadn'thad not already gone to cut the grass.
4. Our daughter had graduated from the university yet. — Our daughter hadn'thad not graduated from the university yet.
5. I made two mistakes in the test. — I did not makedidn't make two mistakes in the test.
6. Were you celebrating your birthday? — Weren'tWere not you celebrating your birthday?

Every year millions of tourists come to Egypt to see one of the 7th Wonders of the World: the Great Pyramid of Giza. It's the only one of the Seven Wonders of the Ancient World which is still standing.

Ancient Egyptians believed that the Sphinx guarded the entrance to the Pyramid Valley. Actually, they choose a mountain to pick Sphinx. They were working days and nights under the burning sun. Some of the workers could die because of hard work and hunger. It was forbidden to come down from the mountain while they were constructing the Sphinx. It was one of the largest and oldest statues in Ancient Egypt. But we still don't know who the Sphinx is. In our days we can see the whole Sphinx's body, its face and even legs. However, many years ago the Sphinx lost its nose. During the ages, there were many theories. Maybe Napoleon destroyed its nose in one of his Egyptian expeditions or probably, it was ruined in a heavy sandstorm. In the 18th century people thought that the aliens took the nose as a souvenir. Who knows, maybe we'll find the Sphinx's nose on Mars?