Помогите исправить ошибки. Спасибо заранее!
1. How long have you worked here? 2. Carla, did you meet Stefan? 3. I haven`t spoken to Mary today. 4. We have not sold many units this week. 5. Sorry, I`m late, I had some problems. 6. Sam`s just gone home. 7. Which countries have you visited?