---When were you born?

---I was born ________ a cold winter morning in 1996.

　 A on　 B. in　 C. at

—When were you born?

—I was born ______a cold winter night.

A. at??????????? ?? B. in????????????? C. on????????? ?? D. from

—When were you born?

—I was born _________.

A. on July 10th, 2000                               B. in July 10th, 2000

C. in 2000, July 10th                                D. on 2000, July 10^th