_____________ by mistakes and setbacks, we have become wiser and handle our affairs better.
A. having been taught
B. teaching
C. to teach
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He dropped the plate,____________ it into pieces.
A. to break
B. having broken
C. breaking
Who had the greatest influence on Carson’s life?
A. )her brother
B. )her father
C. )her mother
What was her major in Pennsylvania College for Women?
A. )English
B. ) science
C. )biology
What happened to many songbirds and harmless insects after the application of DDT?
A. )They died.
B. )They ate the mosquitoes in the area.
C. )They increased in great number.
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