下列各句中加点的成语使用恰当的一项是（ ）（3分）

________ to do it well, Mr Black has got everything ready[ ]

Excuse me, would you please speak a little more ______–Sorry, I thought you could follow me.

Where is your mother —She _______ the supermarket to buy some food.

Hello! May I speak to Mike, please -This is Mike speaking. _______.