1. Listen! I (think) __________ someone (knock) ___________ at the door. 2. Up to the present, we (write) ____________ almost every lesson in the book. 3. The Earth (circle) _____________ the Sun once every 365 days. 4. The farmers (work) ______________ in the field at the moment. 5. How many times (you/ see) ________________ him since he went to Edinburgh? 6. Rivers usually (flow) ________________ to the sea. 7. Look! The boy (cry) _______________. 8. Do you know that man, who (smoke) _______________ there? 9. Mrs. Green always (go) ____________to work by bus. 10. We (be) ___________ from French. We (be) ______________ there for twenty years. 11. That house (belong) ______________ to Mr. Green. 12. Mai (lose) ________________ her dictionary. 3. I (be) ____________ sorry. I (forget) ______________ that girl's name already. 14. I (wait) ______________ for the manager for two hours. 15. You (ever, see) _____________ a lion?