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.