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Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the  blanks from 19 to 28.         Any change in one part of an ecosystem can cause changes  in other parts. Droughts, storms and fires can  change  ecosystems.  Some  changes  ___19___  ecosystems.  If  there  is  too  ___20___  rainfall, plants will not have enough water to live. If a kind of plant   dies off, the animals that ___21___ it may  also  die  or  move  away.   Some  changes  are  good  for  ecosystems.  Some  pine  forests  need ___22___ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire  melts  the  seal  and  lets  the  seeds___23___.  Polluting  the  air,  soil,  and  water  can  harm ecosystems.  Building  ___24___  on  rivers  for   electric  power  and  irr igation  can  harm  ecosystems ___25___  the   rivers.  Bulldozing  wetlands  and  cutting  down  ___26___  destroy  ecosystems. Ecologists  are  working  with  companies  and  governments  to  find  better  ways  of  ___27___  fish, cutting  down  trees,  and  building  dams.  T hey  are  looking  for  ways  to  get  food,  lumber,  and  other products for people ___28___ causing harm to ecosystems. Điền vào số 20

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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 29. Fill in the appropriate word in question 25   The warming of the Pacific Ocean has created weather pattern (25)_______ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (26)_______ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier.   This happening is called El Nino and is used (27)_______ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time.   According to research, weather forecasters (28)_______ know about the coming weather with certainty. Now everything has become completely different.   El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (29)_______ on the global scale either.

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Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the  blanks from 19 to 28.         Any change in one part of an ecosystem can cause changes  in other parts. Droughts, storms and fires can  change  ecosystems.  Some  changes  ___19___  ecosystems.  If  there  is  too  ___20___  rainfall, plants will not have enough water to live. If a kind of plant   dies off, the animals that ___21___ it may  also  die  or  move  away.   Some  changes  are  good  for  ecosystems.  Some  pine  forests  need ___22___ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire  melts  the  seal  and  lets  the  seeds___23___.  Polluting  the  air,  soil,  and  water  can  harm ecosystems.  Building  ___24___  on  rivers  for   electric  power  and  irr igation  can  harm  ecosystems ___25___  the   rivers.  Bulldozing  wetlands  and  cutting  down  ___26___  destroy  ecosystems. Ecologists  are  working  with  companies  and  governments  to  find  better  ways  of  ___27___  fish, cutting  down  trees,  and  building  dams.  T hey  are  looking  for  ways  to  get  food,  lumber,  and  other products for people ___28___ causing harm to ecosystems. Điền vào số 19

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