---We can use QQ to talk with each other on the Internet.---Really? Will you please show me         it?

Study hard, and      will be difficult.

—Which of the caps will you take?—I’ll take _______,one for my father ,the other for my brother.

—Is this ________ key, Tom? —No, that one is ________.

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