—Mike，is this Tom’s pencil?—Oh，yes，it is         ！

 He likes low-carbon life. He lives in the house ________ he built himself out of trash.

---Would your parents like to go to Taiwan for a vacation with you? ---They’d love to, but ______of them has enough time .

Whose cat is this? Is it yours? Is it a white ________?   

–Is this your pen? —No, it isn’t. It’s     pen.