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a. 2. Whose camera is this? It's Bob's. It's his camera. It's his. 
3. Whose watch is this? It's Tony's. It's his watch. It's his.
4. Whose skateboard is this? It's Bill's. It's his skateboard. It's his.
5. Whose foorball is this? It's Paul's and Ann's. It's their foorball. It's theirs.
6. Whose alarm clock is this? It's Pat's. It's her alarm clock. It's her.
b. 1. mone; 2. her; 3. theirs; 4. your; 5. hers; 6. our.