Answer: A, B, C, D

Article 68 of the "Trademark Law" stipulates some illegal acts of trademark agencies: ① During the process of handling trademark matters, counterfeiting , alter or use forged or altered legal documents, seals, signatures; ② solicit trademark agency business by slandering other trademark agencies or disrupting the order of the trademark agency market by other improper means; ③ Violate Article 4 of this Law Article 19, Paragraph 3 and Paragraph 4 of Article 19. Article 88 of the "Regulations for the Implementation of the Trademark Law" details the above-mentioned "behaviors that disrupt the order of the trademark agency market by other improper means", including: ① soliciting by means of fraud, false propaganda, misleading or commercial bribery, etc. Business; ② Concealing facts and providing false evidence, or threatening or inducing others to conceal facts and providing false evidence; ③ Accepting entrustments from two parties with conflicts of interest in the same trademark case.