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21.It is essential that effective actions should be taken to end the situation. 22. It is no doubt that special attention must be paid to the problem of ______________. 23.But both ______________and ______________ have disadvantages. For example, ______________. Which to choose,______________ or ______________? Careful consideration is necessary before you make your own choice. 24. From what has been discussed above, we may reasonably arrive at the conclusion that ______________. 25. We must search for a quick action, because the present situation of______________ is grievous, if allowed to proceed, will certainly lead to ______________. 26. No doubt, if we ignore the problem, there is every chance that ______________ will be put in danger. 27. We need to take a second look at the matter from a wider standpoint, otherwise, we wont ______________. 28. It is high time that ______________. Here are some of the measures that might be taken immediately. 29. In conclusion, we should know about the problem of ______________, and object to ______________. Only in this way ______________. 30.Although it is affected by many factors, still there are certain ways that can make the situation | 
