Final answer:
The prepositional idiom to complete the sentence is 'bring it home,' advising caution when dealing with telemarketers, akin to when multiple others offered similar services such as babysitting, and reinforces the idea of 'caveat emptor' or 'let the buyer beware' when making purchases.
Step-by-step explanation:
The prepositional idiom that completes the sentence "Always bring it home if a telemarketer tries to sell you something." implies that you should always be cautious and remember your baseline principles when dealing with telemarketers who may be offering deals that seem “a dime a dozen.”
This phrase “bring it home” serves to remind you that, similar to when you were younger and you might have babysat, delivered papers, or mowed lawns for money within a competitive environment, you should always be aware that there are many other options available, and there is no need to impulsively purchase something just because it's presented to you.
In the same way the Federal Trade Commission (FTC) checks advertising claims, it's important for individuals to employ their own scrutiny, as expressed by the Latin phrase caveat emptor, meaning “let the buyer beware.”
The prepositional idiom that fits the sentence is 'hang up'.
When a telemarketer tries to sell you something, it's always advisable to hang up. This phrase means to end a phone call abruptly or refuse to continue the conversation.
For example, if a telemarketer calls and tries to sell you a product or service that you are not interested in, you can politely say 'No, thank you' and then hang up the phone.