We spent many years studying the formation of rocks ,.experiencing many sufferings and even dealth .But our hard work _____in the end, and we made it.

  A. paid off    B. paid back    C. given away     D. came out

We spent many years studying the formation of rocks, experiencing many sufferings and even dealth .But our hard work _____in the end, and we made it.

  A. paid off    B. paid back    C. given away     D. came out

We spent many years studying the formation of rocks, experiencing many sufferings and even dealth .But our hard work _____in the end, and we made it.

1. A.
   paid off
2. B.
   paid back
3. C.
   given away
4. D.
   came out