— Why is your father so busy these days?

— He is _________ for my grandfather’s _________ birthday party.

A．preparing; ninth

B．preparing; ninetieth

C．waiting; ninth

D．waiting; ninetieth

继续盘问期间，经县级以上人民政府公安机关批准，公安民警可以对违法犯罪嫌疑人使用约束性警械。