单项选择题 Citric acid can be （）from the juice of oranges，lemons，limes or grapefruit.

单项选择题 When King George（），his brother succeeded him on the throne.

单项选择题 His term of office （）at the end of June.

单项选择题 The organization are （）food to the earthquake victims.

单项选择题 Our force has been（）from the dangerous area.