At ______, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.
A
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Josephwasverylucky（）withhislife;healmostdidnotgetoutoftheroom.
YouthatlettertoJames.However，yodidn't（）.
_____regulartraininginnursing,shecouldhardlycopewiththeworkatfirst.
TheBentPyramidoutsideCairo__________ancientEgypt’sfirstattempttobuildasmooth-sidedpyramid.
John'sscoreonthetestisthehighestintheclass;he____lastnight.