In the park, people were playing happily.

The population is increasing rapidly.

I think the results of this test are unjust.

The number of people protesting against the injustice of this society is increasing.

They gathered to protest against the government's policies.

They held a demonstration to protest against the government's policy.

We should take responsibility as part of society.

The protesters gathered to oppose the government's policies.

He left early to participate in the protest.

I am very interested in social science.