---Look, Maria! The newspaper says the world has a population of 6.8 billion.----Yes. And it is increasing___________ 80 million every year.A. to B. in C. by
—Shall we take a walk after dinner? —________________.
— Jason, I have helped you wash your clothes. — _______________
— Where’s your father, Tom?— He _________ to Changsha.
I don’t want to live in the city center ________ it’s too noisy.
The Greens _________ in China since 1999. They are having a happy life.