1)We finished/have finished our work.It's time to have a rest now.
2)In the last lesson the students took/have taken a very difficult test.
3)We did/have done this exercise.Give us the next one.
4)No,thank you.I ate/have eaten too much.
5)Eight Russian spotsmen became/have become world champions two days ago.
6)I lost/have lost my key.Can you help me to open the door?

1)We finished our work.It's time to have a rest now.2)In the last lesson the students have taken a very difficult test.3)We did this exercise.Give us the next one.4)No,thank you.I ate too much.5)Eight Russian spotsmen have become world champions two days ago.6)I lost my key.Can you help me to open the door?