单项选择题 In manufacturing, cheaper materials are constantly being _________ for the more expensive kind.

单项选择题 Jim, the newly elected director, had to reorganize the entire office; he angrily complained of his _________, who had been so incompetent that everything was left in a mess.

单项选择题 Some people think that a _________ translation, or word-for-word translation, is easier than a free translation.