To keep healthy,Professor Johnson        cycling as a regular form of exercise after he retired.

A.caught on                  B.set out                       C.made for                   D.took up

To keep ______, we must do more out-of-door exercises.

　　A. well　　B. fine　　C. fit　　D. health ‘

To keep healthy,Professor Johnson _______ cycling as a regular form of exercise after he retired.

A. caught on B. set out

C. made for D. took up?

To keep healthy, most retired old people _____ jogging as a regular form of exercise．

To keep healthy, most retired old people____ jogging as a regular form of exercise.

A. take up    B. make up   C. carry out   D. hold out