D. Lack of Topic Sentence: Topic sentence is the main idea, your attitude, your evaluation of something.
Having no topic sentence is bad both for the writer and the reader. First, the reader has to read the entire paragraph to get to the point. Here, the example is one paragraph long. What if the example was a paper of 2-3 pages? This is one side. Lack of a topic sentence also causes the writer to drift away from the topic. He loses control over the writing. He may write 3 sentences about one controlling idea and 1 for the other which causes an imbalance within the writing.
Exercise 4: Try to write only a topic sentence for this paragraph.
I hate lie. I always try not to tell lies and I want that from my friends, too. I think it is the most important behavior. I can believe everything my friends say. In addition, a good friend must say his ideas to me firstly. I mean, he shouldn't talk about me with other people. Especially about the bad thing, he doesn't have to talk because it might be wrong. Secondly, a good friend must help me. He must do his best. He should ask help from me too. If we solve problems together, our friendship will be better and it will become stronger. Thirdly, the talking time is important. I can talk with my friends for a long time, and during that time I must be happy. That's why we should like the same things. In conclusion, trust is the basics of a friendship.