очень 2. Before he moved to Africa, he had called/had been calling them to ask for more information 3. Mr Adam worked as a teacher for a while and then decided/had decided to apple for a job in charity
1. But rock phosphate is a finite resource and the biggest supplies are mined in politically unstable places, posing risks to the many countries that have little or no reserves.
2. Phosphate use has increased in the last 50 years as the global population has grown and the date when it is estimated to run out gets closer with each new analysis of demand.
3. With some scientists projecting that moment could come as soon as a few decades’ time.
4. “Phosphate supply is potentially a very big problem,” said Martin Blackwell, at Rothamsted Research, an agricultural research centre in the UK, and lead author of a new study. “Currently the population is growing and we are going to need more food.”
5. “In a few years' time, it could be a political issue with some countries effectively controlling the production of food by having control of rock phosphate supplies,” Blackwell said.
Have been tested - Новые три вагона поезда-цистерны были испытаны в суровых зимних условия на ж/д в Аляске. will have been completed - Строительство моста и дамбы будет закончено к началу сезона навигации. are being constructed - В настоящее время в Европе и Азии строятся 2500 км скоростных линий. maintains - система кондиционирования воздуха всегда поддерживает оптимальную температуру и влажность в вагоне. is being built - В настоящее время новая высокоскоростная железнодорожная линия строится на севере России. has caused - Потоп значительно повредил железнодорожную ветку.
1. But rock phosphate is a finite resource and the biggest supplies are mined in politically unstable places, posing risks to the many countries that have little or no reserves.
2. Phosphate use has increased in the last 50 years as the global population has grown and the date when it is estimated to run out gets closer with each new analysis of demand.
3. With some scientists projecting that moment could come as soon as a few decades’ time.
4. “Phosphate supply is potentially a very big problem,” said Martin Blackwell, at Rothamsted Research, an agricultural research centre in the UK, and lead author of a new study. “Currently the population is growing and we are going to need more food.”
5. “In a few years' time, it could be a political issue with some countries effectively controlling the production of food by having control of rock phosphate supplies,” Blackwell said.
Объяснение:
will have been completed - Строительство моста и дамбы будет закончено к началу сезона навигации.
are being constructed - В настоящее время в Европе и Азии строятся 2500 км скоростных линий.
maintains - система кондиционирования воздуха всегда поддерживает оптимальную температуру и влажность в вагоне.
is being built - В настоящее время новая высокоскоростная железнодорожная линия строится на севере России.
has caused - Потоп значительно повредил железнодорожную ветку.