Please, help me with Ex.3
and 25 points in your pocket. Thanks

Answer:
has been
has had
has worked
hasn't seen
hasn't been
hasn't traveled
Explanation:
All responses are present perfect tense.
Answer:
1)A, was
2)C, has had
3)B, worked
4)B, hasn't seen
5)C, hasn't been
6)C) hasn't travelled
sorry if some of them are wrong