Complete the sentences

1. I don't know those boys. Do you know
   [him|her|them]?
2. I don't know his wife. Do you know
   [him|her|them]?
3. I don't know Mr Parker. Do you know
   [him|her|them]?
4. I don't know that girl in the white dress. Do you know
   [him|her|them]?
5. I don't know those students. Do you know
   [him|her|them]?
6. I don't know her parents. Do you know
   [him|her|them]?