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Our living space on the earth is getting smaller and smaller Our living space should be measured in cubic volume We need to take some measures to protect space We must create better living conditions for both birds and animals
we plant more trees we be taught environmental science, as well as the science of plants environmental education be directed toward everyone we return to nature
they had no idea about scientific forestry they had little or no sense of environmental protection they were not aware of the significance of nature study they had no idea of how to make good use of raw materials
have had; have had have had, had had, have had had, had
did had done were doing have done
Our living space on the earth is getting smaller and smaller Our living space should be measured in cubic volume We need to take some measures to protect space We must create better living conditions for both birds and animals
just had have just had just have had had just had
our seats had to be changed we had to change our seats our seats were changed our seats will be changed by us
we plant more trees we be taught environmental science, as well as the science of plants environmental education be directed toward everyone we return to nature
positive neutral suspicious critical
faithful grateful thankful appreciative
just have had have just had just had had just had
they had no idea about scientific forestry they had little or no sense of environmental protection they were not aware of the significance of nature study they had no idea of how to make good use of raw materials
the interdependence of water, soils and living things the importance of the proper land use the harmfulness of soil destruction and river floods the extraordinary rapid growth of population
just had have just had just have had had just had
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