The atoms of certain substance are excited in such a way （) they produce coherent light.
A. which
B. who
C. that
D. what
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—Sorry, sir, it's not ready yet. — （) .
A. Please do.I'll be waiting.
B. Ok, hold on, please.
C. Not yet？ Is there some problem？
—Hello, Mr.Snyder.What can I do for you？ — （) .
A. My car sounds like a motorboat at full speed.
B. It looks as if you need a new radio.
C. We'll take a closer look, and get back to you later today.
— Is there some problem？ — （) .
A. I am sorry.The parts have been ordered, but they haven't come in yet.
B. It was supposed to have been ready last week.
C. I will call you as soon as the repair is finished.
— Repair department.May I help you？ — （) .
A. Yes.I'd like to know if my CD player has been repaired yet.
B. I asked for the repair department.
C. Just a moment, please.The manager will be in soon.
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