用括号里的单词的适当形式填空。

1. How much______these pants? They are fifteen dollars. (be)

2. I'm sorry I can't remember the length of the desk. Can you tell me how______ it is? (length)

3. Can I ______ you? Yes, please. I want a T-shirt.(helpful)

4. Cindy______a new blue sweater.(have)

5. Look! The red shoes are on ______for ＄15. (sell)

王先生年收入100万元，生息资产100万元，无自用资产及负债。王先生于年初结婚，王太太的年收入70万元，生息资产40万元，婚后家庭支出130万元，当投资报酬率为5%时，王先生家庭的净值成长率为( )。

A．30.57%

B．34.29%

C．40.51%

D．45.73%