我国公务员的级别共设置（）级，分别与公务员职务（）等次相对应。
参考答案：15、12
I regret to have not paid more attention to our English lessons at school.
A．not paying
B．not having paid
C．have not paid
D．not to have paid
小东同学在某处看到闪电后经4秒后听到打雷声，打雷处距小东多远．
