Call Bob ________ 495-3539.

A. in

B. on

C. at

D. of

Call Bob _______ 495-3539.

A. in

B. on

C. at

D. of

Please call Bob _________495-3539.

A. in            B. on             C. at             D. of

Where did Vera go __________ vacation?

A.in                   B.on                  C.at                D.of