Blank filling Fill the following blanks with the correct choice. A. an array of B. scarcity C. predicted D. global warming Our population is rapidly growing near to 9 billion people and our demand for food, fresh water and energy is ____1____ to double. The ocean, rich in food and minerals, holds vital answers to the problem of survival. Moreover, the advantages of ocean are countless. For instance, the oceans play a major role in controlling our climate, but we have not learned yet how to use them to control ______2___. It is said that ocean organisms hold the promise of cures for __3____ diseases. Given the looming ( 迫在眉睫的 ) cr of water ____4____, we badly need more efficient and less costly methods to desalinate ([ˌdi‘sæləˌneɪt] 淡化海水 ) ocean water. Furthermore, ocean may provide new sources of energy.