The key answer of exercise 5

1

1. to bid for something → to make an offer to buy something at an auction
2. to haggle for something → to negotiate with the seller over the price of something especially in a market

2

1. to get a bargain → to pay a lower than usual price for something
2. to get a discount → to pay less than the original price because the seller lowers the price

3

1. to get a refund → to take something back to a shop and get your money back
2. to get a receipt → to get a piece of paper from the shop to prove you bought something

4

1. to be able to afford something → to have enough money to pay for something
2. to be worth it → for something to be the value of what you paid for it