---Dave, is this your English textbook? ---No, it isn’t mine. Maybe it’s _______.

—Have you got an iPhone 5?—No, many young people began to say “No” to it because of _________ follow-up service. By the way, I am a supporter of Chinese products.

—Look ,that’s Mike,your classmate. --Yes,Let’s go and say hello to_________.

— What do you think of this math problem?—It’s too easy. _____ in our class can work it out.

You are old enough to make decisions by __________.