20. __________cans of cola__________ there on the table?
(A) How many ; is
(B) How many ; are
(C) How much ; is
(D) How much ; are

不可數, 所以需要借助量詞來表達單複數....
例如: 
1.water : a tank of water 
2.coffee : two cups of coffee 
3.tea : three pots of tea 
4.juice : a bottle of juice 
5.milk : a pot of milk 
6.soda : two cans of soda 
7.bread : five pieces of bread 
8.pasta : a plate of pasta 
9.rice : two bags of rice 
10.cheese :three slices of cheese 
11.meat : a pound of meat 
14.oil : a bowl of oil 
15.butter : fifty grams of butter 
16.sugar : a kilo of sugar 
17.salt : a spoonful of salt 
18.pepper : a pinch of pepper