Read the following passage and answer all 5 questions given below

Population ______1_______is one of the most serious problems of the world today. Studies ________2________in this area suggest that the world population is further likely to increase by a few more billions. According to many environmental scientists, ecologists, researchers, and other intellectuals, the rise in the population will lead to several ________3______consequences. Most significantly, the increasing number of people will ____4______more water, more food, and  _____5_______to survive.