填空题 .Rental Car Agent: Hi. How can I help you?
    Customer: Yeah.     1   
    Agent: Okay, we have a couple of economy and full-size cars available.
    Customer: Well,     2    .
    Agent: The main difference is size. The economy car is the smallest, and it seats fewer passengers and can hold less luggage.     3    .
    Customer: Just me and my son.
    Agent: Well, the economy car would work.     4    .
    A. We have one right out front.
    B. what is the main difference between these cars?
    C. How many people are with you?
    D. I'd like to rent a mid-size car for three days.

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填空题 4.