Misc: The electric chair was invented by a?

Questions

11 May 1972 ---------- says his phone is tapped by FBI on Dick Cavett Show ?

12 May 1972 Paul McCartney & ---------- release "Mary Had a Little Lamb" ?

15 May 1972 Bus plunges into ---------- River killing 50 pilgrims (Minia Egypt) ?

22 May 1972 ---------- becomes Republic of Sri Lanka as its constitution is ratified ?

22 May 1972 US President ---------- begins visit Moscow ?