1.  She gave me her phone number a I gave her mine.2. They gave you their car and  I gave my car.3. He gave them his document and I gave us document.4. We gave her ours address and She gave to her's address.5. She showed me her greenhouse and I showed my greenhouse.6. He showed his new pigeons and we showed our's pigeons.7. They told her theis fairy tale and she told her fairy tales.8. She told me about her new pet and I told about my pet too.9. I brought them their a puppy and they brought my puppy too.10. He ruined our sindicate and we destroyes their sindicate in fraiday.

Выделено жирным первое пропущенное слово в каждом предложении. 
1 her, mine
2 their car and you gave them yours.
3 his documents and they gave him theirs.
4 our address and she gave us hers.
5 her greenhouse and I showed her mine. 
6 us new pigeons and we showed him ours.
7 their fairy tale and she told them hers.
8 me about her new pet and I told her about mine. 
9 my puppy and they brought me theirs. 
10 our sandcastle and we ruined his.