Which of the following expository writing topic are good and easier to write?

1) "The elderly are a burden to society." What are your views?

2) Senior citizens can still contribute to society. Do you agree?

3) Given the limited land available in Singapore, is it wise to set aside some areas as nature reserves?

4) Should both parents go out and work when their children are very young? What are your views?

5) 'There is no point in preserving the past. We should be looking to the future.' What is your opinion?

6) "All young people, both male and female, should undertake a period of military or community service." What are your views?