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the danger of our world the importance of conservation that we’re destroying ourselves that we are changing our world
cut it down cut down it cut them down cut down them
a record calling on people to conserve nature a rule worked out by the United Nations an important book published in 1970 an idea that nobody would accept
wonder what to do in the future pay no attention to the UN’s call take no measure in conservation should act quickly to answer the UN’s call
to tell people that trees are very useful to man to warn people not to cut down trees any more to warn that man mustn't destroy forests any more to explain how trees help to prevent drought and floods
a record calling on people to conserve nature a rule worked out by the United Nations an important book published in 1970 an idea that nobody would accept
governments modern technology our rivers and forests the United Nations
will build will be built would build would be built
will pollute; will build will be polluted; will be built is polluted; are built will be polluted; are built
wonder what to do in the future pay no attention to the UN’s call take no measure in conservation should act quickly to answer the UN’s call
People spend more time at shopping centers that have trees In hot countries，urban forests are cool places for walking and other healthy exercises But you are not in rural area Trees take pollution out of the air In 2033，it will have 5 million trees It has many kinds of birds in the country
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