Answer: stingy
Answer: B (big cheese = an important person in a company or an organization with a lot of influence)
Answer: crybaby (informal, disapproving) someone who cries or complains a lot without good reason
Answer: A (to squirrel away = to hide or store something, especially money, in order to use it in the future)
Answer: warm (to warm up, a warm welcome, to warm to somebody)