Choose the most appropriate words or phrases to complete the following passage, and pay attention to the transitive expressions in red.(填写对应序号)Now, with the price of solar power going down, the dawn of a new energy era is just _____1_____. As a result, _____2____ is going to be the greatest challenge for humanity.Butthe water problem is ___3_____. First, unlike coal and oil, water can not be ____4_____. Second, water is ____5_____ with every other sector of society. Third, while water demands are growing, climate change is ___6______ droughts and floods and water supplies are ____7_____.There are solutions, such ashydroelectric dams. Butthey may be incredibly ____8_____. It will ____9_____ for scientists to find affordable solutions to the water problem.Before that, everyone should do his or her bit to ____10____ water.