Would you like to join me for a quick lunch before class?—________，but I promised Nancy to go out with her.

下列各句中划线的成语使用恰当的一句是（）

___ advertisements are of great help, I don’tthink we should entirely rely on them.

d you see clearly who the driver was —No, so quickly _____ that I couldn’t have a good look at the face.

We must speak to the old .