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 31 to 35.Water is our life source. It makes up 70% of our bodies, and the average person actually spends about six months of his life on the bath or a shower. But we are only now learning how to take care (1)______ water. Acid rain has polluted as many as 18,000 lakes. Our seas and rivers are (2)______, too. It is now very ...

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 31 to 35.Water is our life source. It makes up 70% of our bodies, and the average person actually spends about six months of his life on the bath or a shower. But we are only now learning how to take care (1)______ water. Acid rain has polluted as many as 18,000 lakes. Our seas and rivers are (2)______, too. It is now very expensive to overcome the damage that has been done. (3)______, we have some hope for the future because some new sources of water have been discovered. People(4) _____live in Sahara have found fish swimming in deep underground streams. Many scientists also believe that there is a huge lake underneath London. If we have leant something from our (5)______, we should keep these new sources of water clean. But we are only now learning how to take care (1)______ water.