Which of the italicized parts indicates UNCERTAINTY？
A. She can do it herself or ask someone else to do it.
B. The workers were cheerful, or at least they appeared to be cheerful.
C. They"ll stay here only a week or so.
D. Be careful, or you will break your neck.
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如何理解清朝对边疆少数民族地区的政治统治和行政管理得到了空前加强？
The following determiners can be used with uncountable nouns EXCEPT_____.
A. heaps of
B. umpteen
C. a great amount of
D. quantities of
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