sentences:  The Khoja family was based in Bombay, and had been active in Canton (the capital city of the Guangdong Province in southern China) before the Opium War.They had a virtual monopoly on India's overseas merchandising.They continued to maintain a considerable stake in the opium trade through E. Pabaney & Co, with branch offices springing up in Hong Kong and Shanghai during the latter half of the 19th century.