Question

Помогите пожалуйста. Вроде бы сделал, но хочу тут на всякий спросить.

Traditionally, business (to be defined) as the activity of making money by producing, or buying and selling goods, or providing services. Business (to be) a combination of these activities: production, distribution, and sale.
Nowadays business (to play) an increasingly important role throughout the world. And the career opportunities (to grow) in variety and number. To work successfully one (must, to have) proper training and (to be prepared) to fulfill a specific job in the fields of management, marketing, accounting, finance, data processing.

Answer 1

Traditionally, business has been defined as the activity of making money by producing, or buying and selling goods, or providing services. Business is a combination of these activities: production, distribution, and sale.

Nowadays business plays an increasingly important role throughout the world. And the career opportunities grow in variety and number. To work successfully one must have proper training and be prepared to fulfill a specific job in the fields of management, marketing, accounting, finance, data processing.

 можно и так: business is defined