用单词的适当形式填空。

1. Have you ever____(be)to a concert?

2.These songs____ (write).

3. This is the weather report of different_____ (city) have China.

4. Do you know the number of____(concert)they have done?

城市商业银行的注册资本不低于（）亿元人民币，且为实缴资本；资本充足率不低于8％，核心资本充足率不低于4％。

A、0.5

B、1

C、5

D、10