Choose the correct anwser

1.Her(hair is/hair are)very curly
2.Today I have got(much work/manyworks) to do
3.I think too(many mathematics are/much mathematics is)taught in schools
4.We are all eager to increase our(knowledge/knowledges)
5.Could you pass me(a salt/some salt),please?
6.(How much/how many)cheese cubes have you got in the box?