Ex.8. Поставьте сказуемые, данные в скобках, в отрицательную форму. Предложения перепишите

Ex.8. Поставьте сказуемые, данные в скобках, в отрицательную форму. Предложения перепишите и переведите. 1) Labor like that of a musician or a librarian, although useful, [increases] material wealth of society, that is why it is called unproductive labor. 2) Although the economic study had been done at the request of the government, the latter [followed] the recommendations of the analysts. 3) My report about exports of foodstuffs to developed countries [have been finished] yet but I have already found the necessary data in the Internet. 4) The goods prices [vary] greatly within a particular market as all sellers impose practically the same prices. 5) When economic and political situation [is steady] in the country, it [is safe] to store wealth in the form of money.