The professor will be out.
He is embarking upon a 10 day "world tour".
Review your assignments or talk quietly among yourselves.
There will be an exam on all of the material covered this semester.
Sharon Spotbottom will check in from time to time during his absence.
She is generally harmless except when provoked.
Refrain from giving Sharon any mood altering substances.
Especially if she asks for them.
Forewarned is forearmed.