Misc: In 1986 Halley's Comet makes closest approach to ---------- this trip, 63 M km?

Questions

'flag day' is celebrated in canada on what date?

one word in this question is mispelled. what is it's correct spelling peptidoglycan, euphrates, cytokinesis, atrioventricular.?

what invention was named for the 1926 ad 'zip, its open, zip, it's closed?

what word is used to describe extremely severe or oppressive measures?

what's the capital of russia?