1The ozone layer grows/surrounds the Earth. 2It stops the harmful rays from reaching/discovering the Earth.

 3.  The ozone layer gives/allows the good rays to reach the Earth.

 4.  Scientists destroyed/discovered the hole in the ozone layer in the 1980s.

 5.  If we don't do something about it, plants and animals may become extinct/in danger.

 

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The second draft resolution (was not discussed) yesterday; it (had been withdrawn) long before the beginning of the meeting. 2. the inspector is not in town; he (was/has been sent) on a special mission to the mining district. 3. at the publishing house i (was told) that the book (would be published) by the end of the year. 4. you can’t use the refrigerator at the moment, it (is being fixed) by the mechanic. 5. many soviet cities (have been changed) beyond recognition by soviet architects and builders. 6. a new metro line (is being constructed) now. one of its stations (is being built) in our street. 7. like many medieval cities, moscow developed round the walls of a stronghold. first a brick wall (was built) around the merchants' quarter which (is/was known) as kitai-gorod, then, in the 16thcentury, a new wall (was erected) round the so-called bely gorod. 8. maize (is used) by many peoples of the world to make their bread. 9. the reconstruction plan of moscow (was/has been drawn up) with an eye to the city's future growth and work. it (was/has been carried out) on a giant scale. 10. a second talk on how to handle the new machine (will be given) to-morrow at the same time by one of the inventors. 11. no objections to the plan (have been offered) so far, but it (will not be introduced) until it (has been put) to vote. 12. everybody was busy as a welcoming party (being prepared) in honour of the distinguished visitors. 13. some final touches (are being put) to the picture; it (will be completed) in a quarter of an hour. 14. evidently the tea (had been sweetened) before i put sugar into it. 15. meteorology is a comparatively new science and its teachings (are (being) changed) as new discoveries about the climate (are (being) made).