— Why are you so popular with your students?— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
They paid their taxes ____ cash.
Eggs are sold ____ the dozen.
One should speak clearly and it is the same _____ writing.
She must have set off for the village the other day, _____ she?
____ it with me, then I’ll see what I can do.