请用所给的代词填空。 this, that, these, those 1. These keys are mine. _____________ are yours. 2. What's _____________?  It's an egg. What's _____________ over there? It's an orange. 3. Look at _____________ pencils. Are they Lucy's? No, those are hers. _____________ are mine. 4. Hi, Mum, _____________ is my friend, Lucy. your, one, other 5. Can I have two cakes? No, but you can have only _____________. 6. I have two bags. One is big, and the _____________ is small. 7. What's wrong with _____________ bike?  It's broken. 8. How many people are there in _____________ family? There are 6.