1. Listen! I _________________ (think) someone _________________ (knock) at the door. 2. We __________________ (not/know) why Sarah is upset, but she __________________ (not/speak) to us for ages. 3. The Earth _________________ (circle) the Sun once every 365 days. 4. Why _____________________ (you/stare) at me? I suppose you _______________ (not/see) a woman on a motorbike before! 5. How many times _________________ (you/see) him since he went to London? 6. Trevor and Laura like Scabble. They _________________ (play) it most evenings. 7. The number of vehicles on the road ______________ (increase). 8. “Sorry I’m late.” “That’s all right. I _____________________ (not/wait) long.” 9. Mrs. Green always _______________ (go) to work by car, but this week she ____________________ (travel) by bus. 10. We _______________ (be) from French. We ___________________ (be) there for 20 years. 11. He ______________ (work) as a teacher five years ago. 12. Lana _______________ (see) a movie at Great Show theater tonight. 13. Hoang _______________ (call) you many times last night. 14. Linh’s grandfather ______________ (die) 30 years ago. 15. My mother ________________________ (be/water) her cactus trees on the balcony.