Thank you, Mr. Chen. I’m wondering how to ______ the great help you gave me during my study this year.

   A. pay back                  B. keep back              C. hold back               D. look back

--- Believe me, all your efforts will _______ some day.   --- Thanks for your encouragement.

A. pay back         B. pay down                 C. pay off          D. pay for       

If I make good money this time, I’ll __________ all my debts first.

A. pay back                         B. pay off          C. turn up                   D. turn off

The money collected from ticket sales could be ______ food.

A. pay back 　 B. spent on C. paid off 　 D. cost

If I make good money this time, I’ll __________ all my debts first.

A. pay back                  B. pay off              C. turn up              D. turn off