The answer is b <span>structure 2</span>
1. Have you ever travelled abroad?
2. Granny and grandad lived here all their lives
3. Has anyone fed the dog?
4. I haven’t seen you for ages!
5. She makes millions from sports sponsorship deals
6. Did you check your essay for mistakes?
7. We haven’t won a match for two years!
8. You have asked me the same question three times
Formal approach is the best tone to use.
Hope this helped.