1. How long you have you been dealing with them?
2. When did they set up a new company?
3. They have made a lot of improvements in this model lately.
4. Last year our company was heavy with orders.
5. We took part in the conference the other day.
6. They have made two deals this month.
7. We have been carrying out an investigation since September.
8. We did successful research two months ago.
9. He has been on trial for two months.
10.When did you take him on trial?