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21. Well, why is there ______________? I think there might be two reasons. One is ______________,and the other is ______________. 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 ______________. 29. The eventual result it brings out is ______________. And perhaps the most obvious result of | 
