By Thomas MacDonald in Montreal Quebec Education Minister Bernard Drainville attempted to reassure parents Wednesday as he confirmed that the province is still missing thousands of teachers just days before the start of the school year. Despite what the minister described at a news conference as a “big challenge,” he said the government’s goal is to ensure no classrooms are forced to close for lack of teachers. The minister noted there were at least 8,558 vacant teaching positions, 1,859 full-time and 6,699 part-time, in the province as of last week, more than three thousand more than the official, though possibly incomplete, number at the same time last year. “I was a parent. I know what back-to-school is like. It’s stressful,” Drainville said. “It’s even more so when you ask yourself,…