1 . In order to make it clear, I must go   up to________ second floor and ask him________ second time.

A．the; a

B．a; the

C．the; the

2 . —What’s on your desk, Judy?
—It’s _________ English-Chinese dictionary. It’s ________ useful dictionary.

A．an, the

B．an, an

C．an, a

D．the, an

3 . Your son is in great danger and he needs ________ immediate operation which costs 48,000 yuan. (用适当的词填空)