Hong Kong stocks extended this week's rally at the start of trade Friday following another surge on Wall Street. The Hang Seng Index rose 0.21 percent, or 54.86 points, to 25,750.78. The benchmark Shanghai Composite Index rose 0.19 percent, or 6.33 points, to 3326.46, while the Shenzhen Composite Index on China's second exchange gained 0.23 percent, or 5.24 points, to 2305.11. dan/hg