Formal:
* It: "The government itself is responsible for the policy."
* Its: "The government has its own set of priorities."
Informal:
* It: "They say it's going to raise taxes."
* They: "They need to address the issue of poverty."
More specific:
* The state: "The state must ensure the safety of its citizens."
* The administration: "The administration has announced new regulations."
* The authorities: "The authorities are investigating the crime."
It's important to be mindful of the specific context when choosing a pronoun for "government." The best option will depend on the level of formality, the specific government entity being referred to, and the desired tone.