11.  Too much social activities, on the other hand, will cause a lot of problems.

12.  Too much activities, on the other hand, will cause a lot of problem .

13.  Certainly, often changing job can cause a lot of problem .

14.  But the policy caused a lot of bad effects .

15.  Automatically allocating jobs has caused a lot of problems.

16.  China is carrying out the open policy, which cause a lot of joint-venture companies appear.

17.  These problems really cause a lot of troubles and misfortunes to our society.

18.  So I expect to peace all over the world because I know fighting to all over the world causes a lot of suffering-people are homeless, no food to eat, unwearing and no water to drink, even full of illness ..

19.  So doctors have to take up this responsibility, which often causes a lot of controversies and disputes.

20.  We can't give our freedom to the criminals who receive it and cause lots of trouble to us.

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