a) there are a lot of/many apples left.
b) there isn't many/much rain in this part of Russia.
c) how many/much money do you need.
d) i'm sitting in a/an armchair.
e) i haven't got a/an computer in my bedroom.
f) Was/were the exam difficult? Yes is was/were.
g) football is more cheap/cheaper game to play than golf.
h) london is biger/bigger than Cardiff.