"Cheated out of the accomplishments that were surely to come from these extraordinary lives. Their lives were just too short for all the promise and the good that was within them."
The anniversary brings back memories for those who were on campus when Cho started his shooting spree.
Heidi Miller, 20, from Harrisonburg, was shot three times and was one of six survivors in a French class.
"It's like a big question mark," she told the Associated Press. "Should we be in mourning all day, or should we try to do something normal?"
Some of the families of the victims said they would not be attending the official events and planned to grieve privately.
A Virginia Tech professor, Bryan Cloyd, whose daughter Austin was killed, plans to plant an oak tree with his wife Renee.
He told AP he wanted to honour their daughter's life by looking forward, rather than reflecting on the horrors of that day.
"I won't be able to walk my daughter down the aisle at her wedding. I won't be able to bounce her children on my knee," he told AP. "And I don't think it's helpful to dwell on that, because where that leads is just more sadness.
"I think what's helpful to do is to dwell on what can be. What can we do with what we have?"
The events of 16 April 2007 prompted the US Congress to pass the first major gun legislation since 1994, improving background checks on buyers.
Further information about the events of the massacre is expected to be released as the result of a recent settlement totalling $11m (ú5.5m) between survivors and victims' relatives and the US state.
Lawyers said the settlement - designed to prevent future lawsuits - would help families meet medical and other costs.
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