geography: Meridians converge at the ________.?

Questions

In 1918 Britain opened its offensive on the ---------- front during WW I. ?

In 1920 US's first commercial radio, 8MK (later WWJ), ---------- began daily broadcasting ?

In 1921 ---------- Susann, writer (Valley of the Dolls), born. ?

In 1921 Jacqueline---------- , writer (Valley of the Dolls), born. ?

In 1938 Jean-Loup---------- , first French traveler in space (on Soyuz T-6), born. ?