It’s known to all that unless you take ________ exercise you won’t keep good health.

  A．normal               B．ordinary

  C．average               D．regular

It’s known to all that _____ you exercise regularly , you won’t keep fit.

A. if                          B. unless                     C. while                  D. whenever

It’s known to all         you exercise regularly, you won’t keep good health.

A．unless       B．whether    C．although          D．if

It’s known to all that the_____ of life is full of hardships.

  A. journey               B. travel        C. tour                  D. trip

It’s known to all that the_____ of life is full of hardships.