1. By the time Alex finished his studies, he **had been** in London for over eight years.
2. At the moment the population of the world **is growing** at an increasing rate.
3. It **was claimed** that some doctors were working 80 hours a week.
4. My mother suggested I **throw** away some of the stuff in my closet.
5. While we **were doing** the maths test, the fire alarm **went** off.
6. I wish I **earned** enough money to travel around the world.
7. She **has not set** foot in Ho Chi Minh City since she graduated from University of Economy.
8. They said they **had been living** in Chicago for six years.
9. She suggested **traveling** together for safety, since the area was so dangerous.
10. It’s hard for me **to concentrate** on working in such a noisy office.
11. The coffee was all right, but the cream **was** sour.