* I lost my1 pen. Could you please lend me yours2 ? 

* John arrived early for his3 English lesson, but Susan arrived late for hers4 . 

* They have their5 own method of teaching, and we have ours6 . 

* Jane went back to her7 hometown, but Edward left his8 . 

* She says her9 teacher is good, but I think mine10 is better. 

* You think your11 house is the biggest in the area, and they think theirs12 is. 

* We have our13 TV in the bedroom, but they have theirs14 in the kitchen. 

* He has his15 own opinion, and I have mine16 . 

* Mary left her17 umbrella at home, and we left ours18 too. 

* I have my19 holidays in August, and she has hers20 in July

B) Parte 1:1.brothers’2.policemen’s3.children’s4.Melissa’s5.Henry’s

Parte 2:6. The teachers’ room7. the four fish’s bubles8. Mr. Williams’ house9. the conductor’s baton10. the photographers’ cameras

Correcção A)