The plural form for the words would be
Thief=Thieves
Knife=Knives
Wife=Wives
Calf=Calves
Half=Halves
Elf=Elves
Leaf=Leaves
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I'm not sure exactly what the question means but what do u need help with because I can help!
Answer:
Success??
The noun peak can refer to something that is a literal highpoint, like that snow-covered peak over there in the distance, but you will also hear it used to refer to more abstract high points, such as a time of greatest success
D. Skinner
An operant conditioning chamber is a laboratory apparatus used to study animal behavior. The operant conditioning chamber was created by <u>B. F. Skinner </u>while he was a graduate student at Harvard University. It may have been inspired by Jerzy Konorski's studies.
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C. so cold that all the geese flew backwards