I feel regret about what's happened.

单项选择题During the Second World War, all important resources in the U. S. were allocated by the federal government.

单项选择题The little boy was so fascinated by the mighty river that he would spend hours sitting on its bank and gazing at the passing boats and rafts.

单项选择题He was one of the principal organizers of the association.

单项选择题Philip Roth was hailed as a major new author in 1960.

单项选择题This kind of animals are on the verge of extinction, because so many are being killed for their fur.