根据句意用括号中所给单词的适当形式填空。

1. I'd like a pair of _____, please (shoe).

2. They talked on and on very _____ (happy).

3. The _____ are building a tall building. (work)

4. This bag isn't Lucy's , It's _____ sister's. (she)

5. The first lesson is the _____ of all. (easy).

某商场2003年8月份期初存货成本136万元，售价200万元；本期购入存货成本508万元，售价720万元；本期实现销售收入800万元。在采用零售价法核算的情况下，该商场2003年8月份期末存货金额为( )万元。

A．56

B．81.6

C．84

D．120