Определите время Present Tenses: Present Simple, Present Progressive, Present Perfect or Present Perfect Progressive.

1. Burning certain fuels produces sulphur dioxide. This mixes with rainwater and causes acid rain. 2. If the population growth does not slow down, pollution will increase. 3. The reality is that we all have used up the world\'s resources - and simple lifestyle changes can help preserve the planet for future generations. 4. \"Have you switched off the light, dear?\" she asked when we were leaving the house. 5. I have had this bag for a year already. 6. How long have you been using your bike? 7. Some countries have not signed the Kyoto Protocol yet and have refused to change the national way of life. 8. Do you have separate rubbish bins for paper, glass and aluminum in your locality? 9. Look, it is snowing heavily. It has been snowing like that since morning. 10. At the moment many more people are driving cars dangerously and carelessly.