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Here are the correct forms of the given verbs:

1. My mum and dad have lived in Brussels since 2012.
2. A: Where is Pam? B: She has gone to Italy on holiday.
3. My sister has had this job since June.
4. Do you know Betty? I have not seen her before.
5. A: What are you looking for? B: I can't find my keys. I think I have lost them.
6. A: What's the matter with Dan? B: He has broken his leg.