The purpose of a labour union is to improve the working conditions, ______, and pay of its members.17/64Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. The purpose of a labour union is to improve the working conditions, ______, and pay of its members. jobs are secure to be secure the job’s security job securityGiải thíchĐáp án : D Cụm từ: job security: an toàn trong công việc