Choose the best options to complete the sentences

1. Gabriel and his wife
   [have|has] bought three pets this year.
2. Maria
   [have|has] tried swimming for the first time!
3. The Browns 
   [have|has] never had good neighbours.
4. [Have|Has] Millie ever visited your house?
5. My sister
   [have|has] never told me about her tattoo.
6. [Have|Has] you ever been in love?