Solving problems __________ (cooperative) is a better option than resorting to competition and conflict.
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Both doctors and nurses have increasingly made a __________ (special) of the care of the aged.
Agriculture used to be the __________ (economy) backbone of this country.
There is a direct __________ (relation) between exposure to sun and skin cancer.
It was a __________(wonder) occasion which we will cherish for many years to come.