knock on;knock at;knock over;knock

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• 请专业人士帮我翻译哈·后天中午前需要If you visit a Chinese family you should knock at the door first . When the door opens , you'll not move before the host says , “ Come in , please .” After you enter the room , you wouldn't sit down until the host asks you to take a seat . when a cup of tea is put on a tea-table before you or passed to your hand , you'll say “ Thank you , ” and receive it with your two hands , not one hand , or they'll think you are ill-mannered . B
• The last on the earth a man sitting alone in a room,at this moment,suddenly ring out the knock on
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• If you buy more than ten,they knock 20 pence off _____.A.a price B.price C the price D.prices
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• He heard a ___ knock at the door.
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