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 ______________.

32. Why ______________? Some ______________. And the most common case is that ______________. The notable example is to ______________.

31. ______________ will bring the society many benefits. For one thing, ______________. For another thing, ______________.

30. However, just like everything has both its good and bad sides, ______________ also has its own disadvantages, such as, ______________. besides, ______________.

29. The eventual result it brings out is ______________. And perhaps the most obvious result of ______________ is ______________.

28. The causes for ______________ are varied. They include ______________. Perhaps the main cause is ______________.

27. The explanation for this problem involves many factors. For one thins, ______________. For another, ______________. Still ______________.

26. It is reasonable to maintain that ______________, but it would be foolish to persist that ______________. There are three reasons ______________.

25. Why ______________? The first reason is that ______________. The second reason is ______________. The third is ______________. For all this, the main cause of ______________ is due to ______________.

24. It is no easy job to find the reasons for this tendency which involves several complicated factors. For some ______________. For others ______________.