One day at Bluesea Middle School in Hong Kong, about 450 students and teachers went without water at lunchtime. They were in a meeting to learn about saving water. The school also collected about HK $ 10,000. The money would be {#blank#}1{#/blank#}to plant 1,880 trees at the heads of the Yangtze River and the Yellow River.

    The local director of "Friends of the Earth, Ms Wong, explained that {#blank#}2{#/blank#} of the world's population still didn't have enough water for all their {#blank#}3{#/blank#}. She thought that by the year 2020, one half of the world's population would not have enough water. Ms Wong said she had visited the heads of the two rivers three times in the past year. "I had expected them to be clean places, as they are at the top of the rivers.{#blank#}4{#/blank#}, sadly I found that they were polluted seriously, even worse than a few years ago."

    Ms Wong said that if everyone helped save water, the situation would get a little {#blank#}5{#/blank#}. She hoped that everyone could do something for saving. One of the students said, "I'm pleased to come to the meeting. Now I can remember how a third of the population lives. I think I'll try and{#blank#}6{#/blank#}some of my habits. Let's save water together.'