单项选择题
Because Bob had stopped reading his technical journals he was _________ of new development in his field.
单项选择题 When he lost his job he tried to _________ his fortunes by robbing a bank.
单项选择题 He was usually very kind so that his sudden _________ greatly surprised us.
单项选择题 In manufacturing, cheaper materials are constantly being _________ for the more expensive kind.
