Ответ:
1 Have your grandparents ever seen a volcano?
2 Has it ever snowed in July?
3 Have Mum and Dad ever been in a cave?
1 have just heard
2 have just come
3 has just helped
1 I haven't done
2 has borrowed
3 have made
1 Have you ever lived in a village?
2 Have you ever lost keys?
3 Has Bella ever seen a tiger?