Itwasrecommendedthatpassengers_____smokeduringtheflight.
A、notA
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At ______, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.
Modern____perhapscausesmoreproblemsthanitsolves.
Underthis____pressuresomeoftherocksevenbecameliquid.
Ininternationalmatches,prestigeissoimportantthattheonlythingthatmattersistoavoid_____.
_____enough time and money, the researchers would have been able to discover more in this field.
