II. Insert correct words or word-combinations. First letters are given. Write the whole word in the answer.

tries to bring to l all the changes

Dozens of rships of different nations

the land have been carefully s.

the depths of the seas b

designed for complicated ocean research are c the oceans.

has been very t explored.

O, the science of oceans, tries

that take place in the physical and chemical pof water at various depths.

The oceans c 147 million square miles

of the e of 197 million square miles.

Yet, the nature of the ocean was practically u until recently

careful mapping did d new details of the ocean waters.

when new t and careful mapping

The surface c have been charted,

Geographically, this vast eof water

Biking is very useful. but people are not always willing to take the bike in the hands of a number of reasons. one reason - the lack of bicycle lanes. let's examine the pros and cons of cycling and construction of bicycle paths. plus very much. to begin with, a useful exercise, without much effort. secondly, do not pay money for travel, petrol. thirdly, it is very eco-friendly transport. you do not bring any harm to the natural environment and people. and finally, you are simply brilliant and worthy of respect. nevertheless there are disadvantages. to begin with, the majority of roads in our country is not the place for bike lanes. secondly, need money. and finally, the high gas content of the streets. all things considered, i think that is a very good and useful idea. she has more pluses than minuses. i believe that in the future bicycle paths will be an integral part of the road. a bicycle will be an important part of our lives.

1. If it rains, I'll wear a raincoat.(|)

2. If we had taken enough water, we wouldn't have been thirsty.(|||)

3. If the children were older, they would go to the party.(||)

4. Harry would have flown to Helsinki if he had more money.(|||)

5. If Mark does the washing up, his mother will have more time for him.(|)

6. What would you do if you saw a burglar?(||)

7. We would have had a glass of hot chocolate if you had bought some milk.(|||)

8. If I were you I should keep the secret.(||)

9. Ron would understand more if the teacher spoke clearly.(||)

10. If Doris had got up earlier, she wouldn't have been late for school.(|||)