Please choose the correct ending to complete the given sentence: Travel: [header] How to travel abroad [title] Do your research. [step] You need to research where you are going, the flight times and prices for airlines, and which documents you need to take with you. Plan out your itinerary carefully.

Ending1: Some cities, like london or paris, really need a week to see what they have to offer. Travel times also need to be taken into consideration. Ending2: For example, visit a couple of websites of airlines to see what type of itinerary they offer. Pay attention to the price, name, phone number and/or mailing address of each airline. Ending3: This will help ensure that all of your research enables you to see where you want to go. [substeps] Do research on an airline's website, and see what seat guides they offer on planes and what websites they provide online. Ending4: [title] Decide whether you will be flying from 1 area or from another. [step] International flights should likely be just a teaser.

Answer format: ending1/ending2/ending3/ending4