One by one, the students in the classroom next to the science lab began to look up and gasp deeply at first and then quickly cover their noses. Something was going terribly wrong in the science lab, and the smell was beginning to permeate the other classrooms on the hall.
One by one, the students in the classroom next to the science lab began to look up and ______ deeply at first and then quickly cover their noses. Something was going terribly wrong in the science lab, and the smell was beginning to ______ the other classrooms on the hall.
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