My sister was against my suggestion while my brother was________it.[ ]

A．in favour of

B．in memory of

C．in honour of

D．in search of

为了保证孔口安全，一般规定孔深小于（）时，禁止进行孔内爆破。

A.6m；

B.10m；

C.15m；

D.20m。