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. 改革开放作为一场新的伟大革命，不可能一帆风顺，也不可能一蹴而就。