A. To our delight, they quickly adapted themselves to the new working environment.B. Economic benefits must be carefully weighed against the possible dangers of handling the nuclear wastes.C. Individuals who function in terms of this drive do not try to deceive others in regard to a job that they fail to do well.D. We can not only think about our immediate needs. Instead, we should think more about the future. 令我们感到高兴的是，他们很快就适应了新的工作环境。