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