Chinese stocks opened the week on a firm footing on Monday and were track for the fourth straight day of gains, with sentiment boosted by strong commodities, while the Hong Kong market hit four-month highs thanks to capital inflows from the mainland. China’s blue-chip CSI300 index rose 0.7 percent, to 3,436.51 points at the end of the morning session, while the Shanghai Composite Index gained 0.6 percent, to 3,216.83 points.