Patricia has a large glass jar and she got it from her grandfather. The girl 1 it half full with clean water. The water shone 2 in the sunlight. Each drop was proud 3 its own purity (纯净).
One day, Patricia's cousin, Robin, came for a 4 . While Patricia was away, the boy saw the jar and thought: "What will happen 5 I put some ink in the water?"
Robin searched Patricia's desk and found a 6 . Just as he was going to put a few drops of ink (墨水) in the jar, Patricia walked in. "Robin, what are you doing?" she asked. But it was already too 7 . Patricia watched in 8 as the ink slowly mixed in, turning the water blue.
"Don"t you know that once a jar of water gets 9 , it's very hard to get it clean again?" Patricia sounded angry.
"I'm sorry," Robin replied in a low voice. "I was just 10 ."
Patricia 11 to get the water clean, but the jar was too heavy for the two of them to lift up. 12 could only pour some pure water into it. The jar of water would 13 be as clean as it was before.
The world's oceans are just like this jar of water. Once we 14 them, it will be very difficult, if not impossible, to make them clear again. Unluckily, some people and countries don't seem to 15 this. They've poured many dirty or even toxic drops into the world's "jar". But unlike Robin, they are not curious.
