Large numbers of people pass through airports, which presents a _____ for terrorism and other forms of crime.
A. target
B. means
C. end
D. cause
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Pilots remain on high alert for any _____ hazardous conditions during takeoff and landing.
A. partially
B. essentially
C. substantially
D. potentially
That airplane crash dealt a _____ blow to this airline company.
A. light
B. lethal
C. important
D. subtle
The high _____ of people on large airliners provides an alluring target for terrorism.
A. assembly
B. centralization
C. concentration
D. gathering
Eating establishments have started using plastic glasses _____ glasses made out of glass to reduce the usefulness of such items as weapons.
A. is attached to
B. is adjusted to
C. as opposed to
D. is addicted to