ESL, Просунутий рівень

Consider this

The most difficult part for the salesperson is to ......... potential customers of the usefulness of the product.
If you want to get the best out of your sales force, they must believe in the product and be ......... enough to promote it vigorously.
A ......... customer will always return to the same firm and buy again.
That style of dress was once considered to be a ......... but now it is coming back into fashion.
One of the first things to do when you want to ......... a new product is to ascertain its potential demand.
The main business interest at the moment is to watch the supermarkets ......... for the same clientele.
Our sales meetings were reduced to once a fortnight because the weekly meetings were not considered to be ......... enough.
Her ability to ......... facts and figures quickly was the main reason for her rapid rise in the business.
The success of our website is due to the fact that customers can ......... different prices for the same article.
If you want to keep ......... with the latest developements in your field, you have to read the relevant magazines.