题目内容：

Could the Internet be totally free and should it be? Should the Internet be regulated? The recent disorder in the Arab world ____ by a disputed video damaging the image of Prophet Muhammad shows the United States, which is busy ____ global Internet freedom, has paid a huge price ____ the lives of its diplomats。

In an unregulated Internet world, cheating, violence or rumors can ____ serious consequences. Many countries across the world are periodically suffering from “rumors” ____ by the Internet and social media.

The US-led West always promotes Internet freedom and ____ any regulation as investigation, but it should think twice if it calculates the heavy price that has been and has to be paid for “____”. Moreover, ____ the Internet in the West ____ to be free, with no obvious ____ and no limited sites, isn’t the structure of the main pages already hand-controlled, with selected press agencies and ____ occupying clearly dominating positions?

The Internet has helped fight injustice, ____ corruption in places so far apart as Indonesia, India and Latin America. But the Internet could be extremely ____ as well. Various racist or separatist organizations are using their Internet sites to fan ____. Those who are spreading hate are frequently using the Internet as their tool. No country can ____ to make the Internet absolutely free.

The question is how to keep free flow of information ____ while protecting children from unhealthy works, common citizens from ____ rumors and countries from unfair and damaging propaganda (宣传) attacks. And who sets the limits?

The ____ is that there will never be a perfect system. Every country will have to ____ its own system, based on its culture, social ____ and the degree of danger it’s facing.

1.A. led    B. caused    C. damaged  D. attacked

2.A. helping   B. processing   C. promoting  D. improving

3.A. for    B. at     C. with   D. off

4.A. bring   B. reach    C. fetch   D. take

5.A. spread   B. exposed   C. delivered  D. passed

6.A. supports   B. follows   C. opposes  D. dislikes

7.A. free    B. accessible   C. available  D. healthy

8.A. as if    B. even if    C. so that   D. in that

9.A. happens   B. intends   C. offers   D. appears

10.A. interruption  B. interference   C. defense  D. preference

11.A. programs  B. substances   C. channels  D. sources

12.A. uncover   B. strike    C. prevent  D. avoid

13.A. beneficial  B. useful    C. sensitive  D. destructive

14.A. expressions  B. impressions   C. passions  D. affections

15.A. refuse   B. afford    C. fail   D. attempt

16.A. unpolluted  B. unskilled   C. unoccupied  D. uninterrupted

17.A. evil    B. meaningful   C. untrue   D. effective

18.A. importance  B. conclusion   C. description  D. possibility

19.A. develop   B. invent    C. change   D. study

20.A. trends   B. structure   C. surroundings D. factors