V.use the appropriate expressions above to complete these sentences.

show that by 2050 the world’s population will be 3.5 billion.
2 scientists as the harmonious coexistence between organisms and their environment.
are caused by global warming and the greenhouse effect.
is a renewable energy source that converts the energy of tides into electricity.
5 taking two bottles to for recycling saves enough energy to boil water for five cups of tea.
6 since people need more and more land for are being cleared at an alarming rate.

Цунами-стихийное бедствие. Оно уничтожает дома, города и уносит тысячи жизней. Когда вода отливает от пляжей люди бросаются собирать ракушки, хотя на самом деле нужно убегать как можно дальше потому что очень скоро на это место обрушится гигантская волна и смоет все на своем пути.
Tsunami  is very terrible . It destroys the homes of the city and takes thousands of lives. When water pours from the beaches, people rush to collect shells, but actually have to run as far as possible so that very soon this place will fall a giant wave and washed away everything in its path.

If you do not use arms or for some time, they become weak, when you start them again, then slowly become strong again. Yet there are many people who do not seem to know, that memory works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by exercising it regularly, either consciously or unconsciously. When someone else says that his memory is poor, he really means that he does not give it enough opportunity to become strong. The position is exactly the same as that two people, one of whom exercises his arms and legs by playing tennis, while the other sits in a chair or motor-car all day. Have you ever noticed that people who cannot read or write usually have better memories that those who can? Of course, because those who cannot read or write have to remember things: they cannot write them down in a little notebook. They have to remember dates, times and prices, names, songs and stories, so their memory is the whole time being exercised.So if you want a good memory learn from those who cannot read, practice remembering.