Complete the sentences. 1. whose bicycle is this? it's sally's bicycle. it's hers 2. whose pen is this? it's trevor's. it's 3. whose house is this? it's jack and jill's. it's 4. whose car is this? it's ann's. it's 5. is this pen mine or trevor's? it's not trevor's. it's 6. is this robert's computer? yes, it is. it's 7. whose cd is this? it's nevita's. it's 8. whose computer is this? it's robert's and mine. it's