III. Put the verbs in brackets into the correct form. Choose between the Past indefinite and the Present perfect forms:

Что-то связанное с настоящим, незаконченное или только законченное (yet, already, just, recently) - Present Perfect. Конкретное указание времени в прошлом - Past Simple.1. In the past many firms operated on a cash basis. 2. Our firm has already extended its resources through the use of credit. 3. The automobile agency has not constructed its buildings yet. 4. The company has paid mortgage recently. 5. The firm tripled the revenue last year. 6. The use of credit increased our income last month. 7. We have not produced services for sale since 1980. 8. At last our company has decided to reduce cash outgo today.