For the first question, it is more grammatically correct and generally accepted to use articles with nationalities when using it as an adjective. For example; “A Chinese festival”, “ An American drink”, “ A Canadian woman” etc. The nationalities here describe the nouns ( adjectives) so they must go with their respective articles. However, when talking about nationalities on their own, we often skip the articles e.g “Mary is Canadian”, “My teacher is French” etc. For the second question , “ In the mornings or evenings” are considered ungrammatical in Canadian and American English but quite grammatically correct in British English. You can use ‘in the morning’ [afternoon, evening] for both one particular morning, or a series of mornings. But you can use ‘in the mornings’ only for a series of mornings. Hope this helps.

I tell my parents everyday to buy some toys when they come home And I will always love my parents forever. I promise ,I'll be kind.

Both are correct.

In my opinion, good short films should impress people in a very short time. Like some incredible scenes at the beginning. Thus,people can easily be attracted by it.

If you don’t want to go to a gym, how can you stay fit? For me, I think eating less can do it. People normally eat way more than they really need. This may produce fat if people eat more than they need. And also you can eat more vegetables with beef or mutton than pork because they have less fat.

I think that it reduces contamination!

When my mother was alive ,we always travelled as a family and we had a lot of fun. We always to gathered to have dinner together.💔

I think, there are many factors that can influence the success of a business. Opening any business, everyone should have patience. One can lose or gain but they shouldn’t Consider those factors because of getting profit or loss.