If you have not caught what the guest said, you may say " what did you say, sir" or simply "Uh?"
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When the restaurant is fully occupied, you should politely persuade the newly arrived guests to go to some other restaurant.
A. 对
B. 错
When you express your apologies to your guest, you may say "I beg your pardon, sir.' in a falling tone.
A. 对
B. 错
When you ask the guest to repeat what he says, you may say "I beg your padon" in the rising tone.
A. 对
B. 错
What comes with the digital technology in the era of “smart agriculture”?
A. IoT
Big data
C. Network security loopholes
D. Cloud Computing