Определите время present tenses: present simple, present progressive, present perfect or present perfect progressive. 1.burning certain fuels (produce) sulphur dioxide.this (mix) with rainwater and ( cause) acid rain. 2.if the population growth (not, slow) down, pollution will increase. 3.the reality (be) that we all (use) up the world's resources-and simple lifestyle changes (can) (help) preserve the planet for future generations. 4."you (switch) off the light, dear? " she asked when we were leaving the house. 5. i (have) this bag for a year already. 6. how long you (use) your bike? 7. some countries (not, sign) the kyoto protocol yet and ( refuse) to cnhange the national way of life. 8. you (have) separate rubbish bins for paper, glass and aluminium in your locality? 9. look, it ( snow) heavily.it (snow) like that since morning. 10.at the moment many more people (drive) cars dangerously and carelessly.

1. burning certain fuels produces ( present simple) sulphur dioxide. this mixes ( present simple) with rainwater and causes acid rain. 2) if the population growth doesn't slow down ( present simple), pollution will increase. 3. the reality is ( present simple) that we all use up ( present simple) the world's resurecs and simple lifestyle changes can ( present simple) help preserve the planet for future generations. 4. "have you switched off ( present simple) the light, dear? ", she asked when we were leaving the house. 5. i have had ( present perfect) this bag for a year already. 6. how long have you been using ( present perfect progressive) your bike? 7. some countries haven't signed ( present perfect) the kyoto protocol yet and refused ( present perfect) to change the national way of life. 8. do you have ( present simple) separate rubbish bins for paper, glass and aluminium in your locality? 9. look, it is snowing ( present progressive) heavily. it has been snowing ( present perfect progressive) like that since morning. 10. at the moment many more people are driving ( present progressive) cars dangerously and carelessly.

Captain put two oil jars on the each horse.