1
Uncountable
dust. flour. happiness. knowledge. love. milk. meat. music. oil. rain. snow. 

Countable
book. cup. flower. mountain. piano. river. song. table. wall
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2
1 a glass
2 glass
3 wood
4 a wood
5 pity
6 a pity
7 time
8 times
9 beers
10 beer
11experience
12 an experience
13 a chicken
14 chicken
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Uncountable special cases
1
uncountable 			countable
accommodation		flat
publicity			advertisement
baggage			suitcase
money		 		banknote
bread				loaf
traffic				car
information			fact
furniture			table
work				job
travel				journey/trip

2 
All can be used with "a piece of..." except:
a flash of lightning
a stoke of luck
a clap of thunder

3
A word of advice
Our baggage has been ...