Ответ:
Advertising CANNOT torn a poor product or service into a good one.
But what it CAN do - and does - is to create an awareness about both old and newproducts and services.
Careers in advertising MAY involve working for advertisers, media, advertising agencies, or suppliers and special services.
Media salesmen MUST be knowledgeable about business and skilled in salesmanship.
Объяснение:
CANNOT
CAN
MAY
MUST
Это модальные глаголы