1.   At this time next week we                         to work to support the air pollution cutting down campaign.

            A. are cycling             B. will be cycling       C. will cycle               D. will be cycled

      2.   Someone’s carbon                   is a measurement of the amount of carbon dioxide that their activities produce.

            A. footprint                 B. energy                    C. effect                      D. amount

      3.   Remember to               the lights before going to bed.

            A. turn on                    B. stop                         C. turn                         D. turn off

      4.   We will cut down in the use of natural gas because it is                   and harmful to the environment.

            A. available                B. abundant                 C. plenty                     D. limited

      5.   Hydro power is            because dams cannot be built in certain areas.

            A. abundant                B. enough                    C. limited                    D. unlimited
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