题目内容：

二：完形填空（共15小题，每小题1分，满分15分）

阅读下面的短文，掌握其大意。然后从21－35各题所给的四个选项中选出最佳选项，并在答题卡上将该项涂黑。

How to get rid of waste is a great problem for the world today. Waste must be treated   21  it does not become a danger to life.   22  , in some countries, waste from factories is still poured straight into rivers. People who use the water from one of these rivers often get   23 . The water  may become so polluted that it   24  all the fish in the river. When these rivers finally reaches the   25  , it pollutes the ocean.

In many countries with   26 , human waste is piped directly into the sea without being dealt with. This is not   27  . Although the sea itself can break up the waste, beaches   28  become polluted.   29  scientists suggest people take the waste far out to sea in ships where the wind and waves break it down.

In 1989 an international law was passed to   30  people putting waste into the sea. It is now against the   31   to put anything into the sea nearby. Such rubbish as plastics may not be thrown   32  the sea anywhere. Other waste may be put into the sea, either 19 or more than 40 kilometers from land,   33  the nature of the materials.

The   34  of dealing with waste has become so great that several international organizations have been   35   to protect the world and control pollution.

21. A. as if                   B. so that             C. ever since               D. now that

22. A. Luckily               B. Happily           C. Unfortunately         D. Hopefully

23 A. sick                        B. hope               C. rich                        D. fun

24. A. raises                  B. feeds               C. kills                       D. breaks

25. A. pool                   B. lake                C. spring                    D. sea

26. A. grassland         B. plains                 C. sea coasts          D. deserts

27. A. safe                    B. useful                     C. dirty                 D. wrong

28. A. need                   B. may                   C. can’t             D. needn’t

29. A. So                      B. Because              C. Since                D. But

30. A. stop                    B. suggest               C. keep                 D. find

31. A. school                B. organization        C. factory                     D. law

32. A. out of                 B. away from                 C. into                  D. above

33. A. depending on    B. feeding on                 C. leading to       D. connecting to

34. A. news                  B. method               C. problem            D. disadvantage

35. A. punished             B. set up                     C. refused              D. called at