Explanation:
'Hair' can be used as an uncountable noun: 'She has long hair.' But 'a long hair' could mean one strand. However, if she has long hair generally, no article. So 'She has long hair' is correct; 'a long hair' is incorrect if meaning general hair. So error at 'a'.
Explanation:
'Scissors' is a noun that is always plural; we say 'a pair of scissors'. 'Furniture', 'information', 'advice' are uncountable and singular.
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