It's been more than fifty days since I joined the city civilization creation and I hope our city can pass this test. It's been more than fifty days since I joined the city civilization creation and I hope our city can pass this test.

I'm not entirely sure what you mean by "city civilization creation." Is it a committee to improve the city?

It’s easy to keep our environment clean, but it is difficult to let everyone become civilizedmake people practice good stewardship. It’s easy to keep our environment clean, but it is difficult to make people practice good stewardship.

"Let everyone become civilized" has negative connotations...for people to "become civilized" usually suggests that there was something bad or immature about their society before. If you call someone "uncivilized," it may sound insulting, depending on context. I think "practice good stewardship" is closer to what you're trying to say. It means taking good care of the city and the environment in the ways you describe below.

Do it from ourselves, at leasThe least we can do is not nto litter. The least we can do is not to litter.

TidyWhen the environment plus high quality citizens equalis clean and the citizens are conscientious, the city is happinessy and beautyiful. When the environment is clean and the citizens are conscientious, the city is happy and beautiful.

"Clean" sounds more natural to describe an environment. "Conscientious" = thoughtful about their actions, making good decisions, respecting other people.