Exercise 3. Open the brackets using Past Simple or Present Perfect.

1. He already (to build) a house. 2. He (to build) a house last year. 3. They never (to sell) equipment. 4. They (to sell) equipment last year. 5. We (to advertise) the model this week. 6. We (to advertise) the model last week. 7. The company just (to introduce) this model on the market. 8. The company (to make) great achievements 2 years ago.