Recent studies have ________ four major global environmental risks: acid rain, ozone depletion, deforestation and the greenhouse effect.
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The ________ threatened to expel John from school if he kept on behaving so poorly.
The manager is thinking of _______ some of the less efficient workers to reduce cost.
John’s _______ personality kept him from having many friends in the company.
Our school is currently deeply ________ in some improvement plans