The police have searched the mountain the missing student for a few days.

下列各句中，加点的成语使用恰当的一项是（ ）

We were having a meeting ______ suddenly someone knocked at the door[ ]

Rosa Parks was respected by the black people because she had _____ for equality all her life.[ ]

Let’s go climbing to the top of the mountain, shall we—You _______be joking! Don’t you know I’m afraid of high places