1. Digital flat televisions are too expensive for we to buy at this time. 2. It took me so many time to learn this lesson. 3. They listened to their teacher carefully, as they understood the lesson easily. 4. Your friends went to your native village last weekend, weren't they? 5. How about having dinner and then go to the theater? 6. It's possible store solar energy for a number of days. 7. Our environment has become worse but there are many factors causing from men. 8. My recent electricity is enormous so I'm worried in it. 9. She turned on her radio at the lowest in order not to disturb the others at night. 10. What about put rubbish bins around the schoolyard? 11. The streets are wide enough for cars to move easy between lanes. 12. The earth is much hotter so people don't know the way to protect it. 13. They were swimming in the ocean when the storm occurs. 14. Who will look for your business affairs while you are away? 15. Jim said that he was playing the piano in the hall now.