HAVANA, April 22 (Xinhua)-- Cuban leader Raul Castro said his working visit to Venezuela was very important and fruitful, the official daily Granma reported Thursday. 'We reached relevant agreements, and now is the time to put them into practice with necessary flexibility and effectiveness,' Castro was quoted as saying. 'We held in-depth discussions about issues of interest to Cuba and Venezuela, and the two countries are linked by ever closer bonds of solidarity,' he said. Castro made the working visit to Venezuela after attending in Caracas the Bolivarian Alliance for America (ALBA) summit and the celebrations of the bicentennial of the beginning of Latin America's fight for independence. He returned home Wednesday. Castro said the whole trip was an intensive one, during which he and his delegation 'slept very little in those less than 72 hours.' 