1£© Travelling west, you set your clock __7__; travelling east, you set it ahead.
    A. behind             B. forward          C. back               D. ahead
2£© Travelling __15__ today becomes yesterday; travelling west it is tomorrow.
    A. south                       B. east                 C. north              D. west
3£© So the slave was pardoned and __50__.
    A. killed                       B. rich                 C. happy              D. freed