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使用电钻应注意电源线和外壳接地线应用铜芯橡皮软电缆，外壳应可靠接地
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A. No. I didn't do well enough.
B. Who told you that?
C. Thanks.
D. Yes, I got a good mark.
【单选题】
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A. I can't.
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A. Excuse me
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－ Haven't seen you for ages. Let's have a get-together next week._____
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A. No thanks.
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A. Not until next week.
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A. Yes, would you please help me with the bag?
B. Help me find my key, please.
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A. Sorry, I don't need your help.
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【单选题】
- Sorry to have kept you waiting. ____
A. That's OK.
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- What is she?____
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___ No, thanks. I'm just looking around. I'll let you know if I want anything.
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