Scientists _______________ (study) the Amazon rainforest for years., They _______________ (already / place) 20 nesting boxes near the pond, The government _______________ (try) to reduce air pollution since 2000., I _______________ (just / make) a donation to the conservation project., Volunteers _______________ (collect) rubbish at the beach all morning., Acid rain _______________ (wipe out) some species of plants., We _______________ (recycle) cans and newspapers for years., She _______________ (never / see) a camel in the desert., The wind _______________ (carry) polluted clouds across the sky all day., They _______________ (already / build) a nesting box for birds., They _______________ (just / join) the environmental club., Acid rain _______________ (damage) the soil in this area for many years., I _______________ (never / breathe) such fresh air!.

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