Question

complete the sentence to explain why the ioc requires a proposal.
cities that want to be an olympic host must prove they can plan and carry out
a: their plans must reflect the of
options: a successful event, an expensive budget, a private contest

Explanation:

The passage focuses on the requirements for Olympic host cities, including planning for athlete support, security, and event logistics, which all serve to run a successful event. The context emphasizes the need to execute the Olympics properly, so the first blank aligns with proving ability to run a successful event. While the Tokyo example mentions cost, the core requirement is a viable event, not just an expensive budget. A private contest is irrelevant to the Olympic Games, which are international public events.

Answer:

First blank: a successful event
Second blank: (based on the passage's focus on logistics, safety, and athlete support, the logical completion would be something like "needs for athletes, security, and logistics", but from the implied context of the question, paired with the first choice, the full completed sentence is:
Cities that want to be an Olympic host must prove they can plan and carry out a successful event. Their plans must reflect the needs for athletes, security, and logistics (or if constrained to implied alignment with the passage, the key priority is the successful execution, so the second blank's intended match is the core operational requirements, but given the first option set, the definitive first answer is:

1. a successful event
2. (the passage implies the "needs of athletes, security, and event logistics", but as a paired completion, the full correct sentence is:

Cities that want to be an Olympic host must prove they can plan and carry out a successful event. Their plans must reflect the requirements of athlete support, security, and event operations.

But based on the options provided for the first blank, the confirmed answer for the first dropdown is:
a successful event
For the second blank, based on the passage content, the intended answer is something like "needs of athletes, security, and logistics", but if we follow the passage's focus, the most accurate completion tied to the text is:
requirements for athlete care, security, and events