Actually "ko" isn't needed here. But maybe if you put "baki" after "aani", it will sound better. Are you trying to say the report is yet to come? that it is not here yet? If so, then yes, say "report aani baki hai".
October 12, 2012
sentence is correct, chennai-tiruanantpuram's 850km corridor's report is yet to come.
October 13, 2012
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