13. There are many ways to ______________. First, ______________. Second, ______________. Third, ______________.

12. But I don’t think it is a very good way to solve ______________. For instance, ______________. Worst of all, ______________.

11. ______________ may be preferable to ______________, but it also suffers from the disadvantages that ______________.

10. The advantages of ______________ are much greater that those of ______________. For instance, ______________.

9. ______________ may be preferable to ______________, but ______________ suffers from the disadvantages that ______________.

8. Although ______________ has a great advantage of ______________, it can’t compete with ______________ in ______________.

7. However, ______________ may cause some problems. First, it is ______________. Second, ______________. Finally, ______________. So, it is clear that ______________ has its advantages and disadvantages.

6. Confronted with AAA, we should take a serious of effective measures to cope with the situation.

5. A great number of solutions are being offered. Some people suggest that ______________. Others argue that ______________.

4. The picture can reminds you of some strange, yet familiar phenomena existing in our society.