Please choose the correct ending to complete the given sentence: Travel: [header] How to prepare for international travel [title] Get a passport. [step] You need at least two passport-size photos, your birth certificate, and one other form of identification that proves your citizenship in your country of origin. If you already have a passport, ensure that it has at least 6 months left before its expiration date.

Ending1: If you have already been living abroad for two or more years but have not yet become a citizen, you can apply for a visa to enter the country. [substeps] You will need to have a list of u.s. Ending2: It's usually best to get two or three passport photos in one year. However, don't underestimate the sheer potential of your passport simply to convince a passport servicer that you have a sturdy resemblance to the country that you're traveling to. Ending3: Some countries will not issue a visa to you if your passport expires in less than 6 months. [substeps] If you don't already have a passport, you'll need to allow 4-6 weeks for processing, so be sure to start this process ahead of time. Ending4: [substeps] Your passport must be valid for at least one year. If you did not intend to leave your country before your passport expiration date, contact your local government or consulate.

Answer format: ending1/ending2/ending3/ending4