The problem ________ when the students refused to do their homework.
A
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Human behavior is mostly a product of learning ________ the behavior of animals dependsmainly on instinct.
Forthenewcountrytosurvive,________foritspeopletoenjoyprosperity,neweconomicpolicieswillberequired.
I bought this eighteenth century writing desk at a quite ________ price.
Iboughtthiseighteenthcenturywritingdeskataquite________price.