how much / how many / a lot of

1.I need two piece ofbread.
2.They have many boxes of cereal in this aisle.
3.She's buying four carton of soup.
4.Tan needs a pound of group beef.
5.Mario is buying a gallon vainilla ice cream.
6.Do you want a piece of cheesecake?
7.The dogs eats two pound of meat a week.
8.We are buying one pound of flour.
9.The restaurant needs five gallon of oil.
10.They are buying two bottles of pickles