The happiest people don't have the best of everything. They just _______ everything.

A．get away from

B．make the best of

C．fix attention on

D．catch up with

— Do you know when the teacher ______ back tomorrow?

— Sorry, I don't know. If he ______ back, I will tell you at once. [ ]

A. comes; comes

B. comes; will come

C. will come; comes

D. will come; will come