Interest is the most important (Or, you can say: Interest is the most important thing)
Modern time parents always take childen to attend different kinds of interesting classes, such as singing, dancing, playing an instrument and so go. Whatever you choose, I think interest is the most important thing. If you like it you study easily and quickly. If you don't like it, you will get into trouble.
When I was a child, I liked dancing and singing the best. At first, my mother added me into a violin class. I was not interested in it so I felt bored and suffered. Every time the teacher didn't appreciate me. After several months I felt no confidence to go on studying. Also, I didn't play the violin very well. Finally I gave up on it. Meanwhile I began to study dance. Before the real class began I usually liked dancing by myself. I felt very happy when I danced. I anticipated the real class, so I studied very hard every time. The teacher usually gave me a high price and assessment. I am enjoy the dance class because I can find confidence in it. Day by day I love it more and more I study it better and better.
In my opinion interest is the most important thing. Cultural interest ability is more important than study skills.
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You've done a great job expressing your thoughts on studying subjects that interest you, and do not interest you. I was able to follow along easily. Your mistakes were mainly spelling errors and tenses. You should also know that the words "interest" and "interesting" are used differently. They both mean the same thing, but "interest" is a noun and "interesting" is an adjective. Keep up the good work. :)
