-How do you go to work every day? -( ).A. On foot B.On feet

-How do you go to work every day? -( ).A. On foot B.On feet C.By a bike D.In b
-How do you go to work every day? -( ).A. On foot B.On feet C.By a bike D.In bike
It ___ me about 10 days ___ painting the walls. A. took; to finish B. cost; finishing C. took; finishing D. spent; to finish