لا الاجابة الصحيحة on
و حتى في موقع اجنبي الإجابة الصحيحة on
......... Wednesday night, I'm going to take the staff out for dinner.
(a) About
(b) In
(c) On
Correct answer: (c) On
We use 'at' for time ('at 8 o'clock', 'at noon') and in the idiomatic 'at night'. If you put 'Saturday' into the phrase, it is no longer idiomatic, but takes 'on', which we use for days: 'on Saturday', 'on June 1st', etc.