1. I think you shoudn’t do if it’s the right thing to do. 2. Children oughtn’t spend too much time playing computer games. 3. Why not you try the cake I have just made? 4. A lot of money were found in his flat by the police yesterday. 5. A dolphin gives birth of one calf every two years. 6. What would you do if they refuse to give you that job? 7. There is not many information available on that subject . 8. My teacher often explains the lessons again unless some of my classmates don’t understand them. 9. Oils spilled from tankers. This makes the marine life be in risk . 10.If there isn’t electricity, our life would come back to the Stone Age. 11. Erosion, which washes away valuable topsoil, can prevent by planting trees and grass. 12. That pottery was found by an archaeologist while she was worked in this area. 13. The children are only allowed watching television on the weekend. 14. You can't go into the reception if you've got a ticket. 15. She wanted to know whether I have seen Paul recently