1. Luckily, I had backed up my drive ___________ it broke down.

2. He simply ________ in because we ________ to lock the door.

3. Tom ________ any Chinese courses before he ________ to China.

4. They _______ much better after they ________ to the new house.

5. Enas ________ the windows before the sandstorm _________ .

6. _______ a list before they went shopping?

7. Rami ________ to the store until he _________ out of food.

8. By the time we _________ my father _________ the airport.

9. By the time the meeting __________ over, the rain _________

10. He _________ the bill when he ________ payment reminder.