Complete the sentences using one of these verbs: get, change, rise, fall, increase. You don't have to use all the verbs

1) The population of the world is rising very fast. 2) Ken is still ill but he is getting better slowly. 3) The world changes. Things never stay the same. 4) The cost of living increases. Every year things are more expensive. 5) The economic situation is already very bad and it is falling worse.