Lowering personal production of waste___everyone over the past decade.
A. benefited
B. has benefited
C. benefits
D. benefiting
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The problem of global warming___for decades.
A. has been existed
B. has existing
C. being existed
D. has existed
Let everybody___something to reduce environmental pollution.
A. do
B. to do
C. doing
D. do it
Turn on the television or open a magazine, and you___advertisements advocating reducing carbon footprints.
A. will often see
B. often see
C. are often seeing
D. have often seen
If the lights were on, they___have been at home.
A. must
B. need
C. shall
D. would
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