1. I don’t know those girls, do you know them?
2. I don’t know that man, do you know him?
3. I don’t know these people, do you know them?
4. I don’t know Fred’s wife, do you know her?
5. Jane and I were at college with you, do you remember us?
6. I’m talking to you, please listen to me!
7. The photos are nice, do you want to look at them?
8. I don’t like dogs, I’m afraid of them
9. Do you know that man? – Yes, I work with him
10.Who is that woman? Why are you looking at her?
если бы было photo то it, а photos - множ. число, поэтому them