题目内容：
Different countries anddifferent races have different __________11__________. In China, it is important for the host to be attentive towards the guest. The host shows this by__________12__________ that the guest's glass is always full and that there is always __________13__________food in his bowl. It is considered unnecessary to ask whether the guest wants more. In contrast, in England the host may behave more informally. The host __________14__________ places the food in the middle of the table and tells the guest to help himself. It is considered unacceptable to __________15__________ food or drink upon a guest, so the host never gives him anything without first checking whether he wants it.____________
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