Be serious!

Be serious!
A: Will the boss come back soon?
B: Yep. Be serious! Stop messing about! Get busy!

Learn more:
Psycho!
Catch Me!
Bother You!
Lobster!
Behave Yourself!
Babanas!
Chump!
Fancy That!
Snitch! - Snob! - Snooks! - Socko! - Sourpuss! - Speaking! - Square!
Cheese It!

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Importance Of Reading Newspapers