David’s effort was ______, because he won the first prize in the English speech contest, which made his classmates surprised.                                          

David’s effort was ______, because he won the first prize in the English speech contest, _____ made his classmates surprised.                                           

A. paid off; which              B. paid back; it      C. paid for; that                D. paid up; he

David’s effort was ______, because he won the first prize in the English speech contest, which made his classmates surprised.

1. A.
   paid off
2. B.
   paid back
3. C.
   paid for
4. D.
   paid up

David’s effort was ______, because he won the first prize in the English speech contest, which made his classmates surprised.                                          

A. paid off             B. paid back         C. paid for            D. paid up

David’s effort was ______, because he won the first prize in the English speech contest, _____ made his classmates surprised.                                           

A. paid off; which         B. paid back; it   C. paid for; that            D. paid up; he