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中间段 22. There are, I think, two main reasons for ________. In the first place, ________. In the second place, ________. Therefore, ________. 23. Why ________? For one thing, ________. For another, ________. Perhaps the main reason is ________. 24. It is no easy job to find the reasons for this tendency which involves several complicated factors. For some ________. For others ________. 25. Why ________? The first reason is that ________. The second reason is ________. The third is ________. For all this, the main cause of ________ is due to ________. 26. It is reasonable to maintain that ________, but it would be foolish to persist that ________. There are three reasons ________. 27. The explanation for this problem involves many factors. For one thins, ________. For another, ________. Still ________. 28. The causes for ________ are varied. They include ________. Perhaps the main cause is ________. | 
