19. However, if not managed properly, ______________ can create many problems. Sometimes ______________. Furthermore, ______________. Therefore, ______________ has been gaining public concern.
        20. There are probably many reasons for ______________. First, ______________. Second, ______________. Finally, ______________.
        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 ______________ is ______________.
        30. However, just like everything has both its good and bad sides, ______________ also has its own disadvantages, such as, ______________. besides, ______________.
        31. ______________ will bring the society many benefits. For one thing, ______________. For another thing, ______________.
        32. Why ______________? Some ______________. And the most common case is that ______________. The notable example is to ______________.
        33. There are many reasons responsible for this instance, and the following are the typical ones. For one thing, ______________, in addition, ______________. The main reason is that ______________.
        34. People had figured out many ways to solve this problem. Firstly ______________. Though this method has its good sides like it can ______________. One of its bad sides it brings about is that it can ______________.

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