A. Democracy will keep developing along with the progress of socialism.B. As a great new revolution, reform and opening up are not to be plain sailing or be accomplished overnight.C. Chinese culture has been an unfailing driving force for the Chinese nation to keep its unity and make progress from generation to generation.D. Upholding the one-China principle constitutes the political basis for peaceful development of cross-Straits relations. 社会主义愈发展，民主也愈发展。