Rising for the second straight session, the Sensex at the Bombay Stock Exchange gained 135 points, or 0.7 percent, to close at a nearly two-week high of 19,636, on fag-end buying by investors, amid positive European markets, today. The Nifty at the National Stock Exchange rose 42 points, or 0.7 percent, to 5,940.Stock markets in Japan, China, Hong Kong, South Korea and Singapore again ended mixed.