She cooked dinner by ________ (she)．
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That's my father. ________ (him) is reading a newspaper.
Bob is a friend of ________ ( I ). We often help each other.
Shall we wait for ________ (they) at the school gate?
企业为履行当前或预期取得的合同所发生的、不属于其他企业会计准则规范范围且按照收入准则应当确认为一项资产的成本，应在（ ）账户核算。
A. 合同资产
B. 合同履约成本
C. 合同取得成本
D. 应收退货成本
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