$1.$ A painter refuses to finish painting Charles$$s house unless Charles pays him an extra $$100$ beyond the agreed contract price. Charles does not have to pay the extra money because this is an example of $\_\_\_\_\_\_\_\_$blank.

Multiple Choice

a$.$ promissory estoppel

b$.$ preexisting duty

c$.$ illusory promise

d$.$ past consideration

$2.$ Which of the following is an example of a unilateral contract?

Multiple Choice

a$.$ David tells Elizabeth that he will pay her $$1,000$ if she paints his house before October $1$st$.$

b$.$ Frank offers to clean Howard$$s house for $$125.$ Howard agrees to pay Frank $$125.$

c$.$ Abbey promises to mow Bailey$$s lawn for $$50.$ Bailey agrees to pay Abbey $$50.$

d$.$ Bob agrees to sell his motorcycle to Tommy for $$6,000.$ Tommy agrees to buy Bob$$s motorcycle for $$6,000.$

$3.$ For a promise to be enforced by the courts, there must be $\_\_\_\_\_\_\_\_$blank.

multiple choice

a$.$ a benefit to the promisor

b$.$ past consideration

c$.$ consideration

d$.$ lack of consideration

e$.$ promissory estoppel