"On" is used for days (on Monday, Tuesday, etc.), "In" is used for the time of day (in the morning, in the evening, etc.)
So, "on Friday morning" is correct because the emphasis is put on Friday.
April 18, 2014
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IN the morning but ON Friday morning.
April 18, 2014
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Rainie Fang
Language Skills
Chinese (Mandarin), Chinese (Other), English, Japanese