Complete the second sentence so that it means the same as the first. use the word given. 1 the world's population is certain to increase in the next 50 years. (will) the world's population in the next 50 years. 2 not much rain means less fresh water to drink. (going) there hasn't been rain, so there be less fresh water to drink. 3 by 2100, there is a chance people will be living on mars. (might) by 2100, people on mars. 4 l plan to be back in two weeks' time. (will) in two week's time returned 5 many animal species are sure to die out because of global warming. (will) many animal species because of global warming.