For more than a decade, that certain species are becoming scarce. A. the warnings of bird-watchers B. warn the bird-watcher C. a warning for bird-watchers D. bird-watchers have wa
For more than a decade, ___________ that certain species are becoming scarce.
A. the warnings of bird-watchers
B. warn the bird-watcher
C. a warning for bird-watchers
D. bird-watchers have warned