Circle the odd one out

II. Circle the odd one out.

1. A. mountain​B. valley​C. cave​D. club
2. A. big​B. building​C. capital​D. desert
3. A. confident​B. intelligent​C. strong​D. exciting
4. A. compass​B. plaster​C. painkiller​D. forest
5. A. bigger​B. smaller​C. strongest​D. hotter