A.
Wallwork,
English for Academic Research Grammar Exercises,
DOI 10.1007/978-1-4614-4289-9_16, © Springer Science+Business Media New York 2013
16.1 numbers 1 Since the early (1)
¢ s / s / 1980’s , birds have been commonly used as a bio-indicator due to their immediate response to
changes in food availability, abundance and weather conditions. We studied the reproductive biology of the eagle during (2)
fi ve / 5 breeding seasons in the Lake District, England. We monitored (3)
one hundred and nine / 109 nests associated with about (4)
ten / 10 pairs of eagles. (5)
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