Exercise 4: Fill in the gap with the correct verb form. Use Present Simple, Present Continuous, Present Perfect or Present Perfect Continuous:

16. We have been writing (write) this report for four hours. I'm tired. Let's have a break. *Объяснение:* Используем Present Perfect Continuous (have been writing), так как действие началось в прошлом, продолжается до сих пор и имеет результат в настоящем (I'm tired).