单项选择题
There is not much ______ in this building; you can hear what a person in the next room is say ing quite clearly.
单项选择题 She wanted him ______ all the handles and gears in his automobile until she thought she could run it herself.
单项选择题 The main advantage of a system of guaranteed existence is ______.
单项选择题 The existence minimum should be limited to a period because ______.
