---Do you know ____________ the population of China is?---Yes, it has the __________ population in the world, about 1.3 billion.

Try to be careful. The ________you read, the fewer mistakes you will make. 

Our school reading room ________ from 8a.m. to 5p.m. every day.

I can't find ________ beef in the fridge. Shall I buy some?

—Would you like to have_________?—No, thank you. I’ve had enough.