Choose the right tense 1. the leaning tower of pisa (not fall) , it (roll) . the tower (start) to move southward in september and this (continue) until january. 2. the debate about the chinese dinosaur discovery stili (go on) . 3. scientists (debate) how old dinosaur fossils are, with estimates ranging from around 120 million years to about 140 million or older. 4. prior research (suggest) that ancestors of birds belonged to the same class of dinosaurs that sinosauropteryx occupies. 5. most colleges (hold) retake examinations twice a year, in january and in june. 6. the depleted оzone layer above the antarctic and arctic (transmit) far more ultraviolet-b radiation to the surrounding seas. 7. the world (warm) at the accelerated rates predicted by the ippc (intergovernmental panel on climate change) as concentrations of carbon dioxide and other greenhouse gases go on building up in the atmosphere. 8. british negotiators (report) third world nations regard access to western environmentally-friendly technologies “as of almost equal importance to financial resources”.

10. Have you locked the door? 11. I can't go out because I haven't done my work yet. 12. He has written a letter but he can't find a stamp. 13. Here are your shoes. I have just polished them. 14. I left my house at 8 o'clock and I arrived here at 12 o'clock. 15. Have you ever been here? Yes, I spent my vacation here last year. 16. Did you hear? Susanna has got married. 17. I have never played golf. 18. He has smoked twenty sigarettes today. 19. Tom lost the key yesterday. 20. Did you see this film on TV yesterday?

A person always cares about the beauty, comfort and well-being of his home. We try to keep the air in our house clean and fresh, so that dust on the shelves and closets does not accumulate, the floor shines with its cleanliness, the plants in the apartment are pleasing with their green color; we add more colors in our home, picking up bright wallpapers and color accessories. When in the house order and cleanliness, it becomes light and comfortable in the soul. However, when we go out of our safe apartments to the street, this feeling of comfort and warmth disappears. City streets are overflowing with household garbage, the air is saturated with emissions of cars and enterprises, trees are becoming less and less vehicles. Birds appear less and less in cities, and only stray dogs seek food. However, the human eye becomes accustomed to such an environment, and only those moments when a person chooses a town remind man that he is a part of nature, and that our planet is our home..