Bonjour, Pourriez vous m'aider pour cet exercice en anglais !!?

Consigne : Complete the sentences using one of these verbs : get / change / rise / fall / increase
You don't have to use all the verbs and you can use a verbs more than once.

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

Merci d'avance !