The iPad isn’t ______.  It belongs to ______.

I have a pet, ______ name is Polly.

—______is the Changjiang river in China, do you know?—Yes, it’s about 6,380 kilometers long.

--- What’s wrong with my son, doctor? --- ____________ serious, just a slight cold. He’d better drink some water.

- _______ is the train station from the school? -- About twenty-minute bike ride.