поставьте в present perfect
пример:
a popstar/you/meet/have/ever? Have you ever met a popstar?
1. Russia/teacher/has/your/be/to?
2. never/rollercoaster/have/on/they/a/ride.
3. Italy/never/has/friend/be/my/best/to.
4. haunted/you/a/explore/have/ever/mansion?
5. ever/The Great Wall/visit/of/he/has/China?
6. helicopter/fly/never/have/I/a/in.