Start out right away, _____you’ll miss the first train.

A. and      B. but      C. or      D.while

Start studying early and don’t study too much 　　.

A.at one time　　　　　　　　　　B.at a time

C.at times　　　　　　　　　　　D.from time to time

Start out right away, _____you’ll miss the first train.

A. and      B. but      C. or      D.while

Start out right away, _____you’ll miss the first train.

A. and      B. but      C. or      D.while

Start out right away,         you’ll miss the first train.

      A. and                      B. but                      C. or                        D. while