词形转换，用括号内所给单词的适当形式填空，毎空格限填一词。

1.Li Ma is an outstanding tennis ___________ (play).

2.Be __________ (care) when you cross the street.

3.October is the ___________ (ten) month of the year.

4.Recently, scientists have found that dogs are ___________ (smart) than cats.

5.Such an important problem should be discussed __________ (serious).

6.Anna had a fever yesterday, so she was __________ (able) to go to school.

某公司普通股发行价为10元，市场价格为20元，筹资费率为5%，第一年发放现金股利1元，以后每年增长2%。假定所得税率为33%，则该股票成本为（）

A、5.53%

B、7.26%

C、7.26%

D、12.53%