Misc: How many time zones are there in the world?

Questions

In 1970 ---------- kills estimated 300,000 in Bangladesh. ?

In 1971 ---------- 9, first orbit of another planet, first orbit of Mars. ?

In 1981 First manned ---------- flight across Pacific Ocean ended. ?

In 1982 Korean boxer Duk Koo Kim fatally injured when KOed by Ray---------- . ?

In 1982 ---------- War Memorial dedicated in Washington, DC. ?