Dec 20 (Reuters) - Canada's main stock index fell on

Friday, on course for its biggest weekly drop in more than a

year, as investors fretted about the path of global rates next

year, a possible U.S. government shutdown and slowing global

growth.

At 9:32 a.m. ET (1432 GMT), the Toronto Stock Exchange's

S&P/TSX composite index was down 0.3% at 24,332.93

points.