III. Put the verbs in brackets into the correct form. Choose between the Past indefinite and the Present perfect forms: 1. In the past many firms (operate) on a cash basis. 2. Our firm already (extend) its resources through the use of credit. 3. The automobile agency has not (construct) its buildings yet. 4. The company (pay) mortgage recently. 5. The firm (triple) the revenue last year. 6. The use of credit (increase) our income last month. 7. We (produce, not) services for sale since 1980. 8. At last our company (decide) to reduce cash outgo today.

1. In the past many firms operated(operate) on a cash basis.
2. Ourfirm  has already extended  (extend) its resources through the use ofcredit.
3. Theautomobile agency has not constructed  (construct) its buildings yet. 
4. Thecompany has payed  (pay) mortgagerecently.
5. Thefirm  tripled (triple) the revenue lastyear.
6. Theuse of credit (increase)increased  ourincome last month.
7. We havenot produced (produce, not) services for sale since 1980.
8. Atlast our company has decided (decide) to reduce cash outgo today.