Misc: A shark must keep ___ ____ to stay alive?

Questions

In 1980 Sugar Ray ---------- regains WBC welterweight championship. ?

In 1984 William Schroeder, becomes second to receive Jarvik-7 artificial---------- . ?

In 1716 First lion to be seen in America was exhibited in---------- . ?

In 1778 Captain Cook discovers ---------- (in the Sandwich Islands). ?

In 1865 "Alice in ---------- " is published. ?