Whether you are an American citizen or a foreign national living in the United States, travel abroad requires preparation. Travel may be for the purpose of attending meetings or activities in other countries, visiting families or simply taking a vacation. This page is intended to provide guidance and useful resources.
What information do U.S. citizens need
Depending upon the requirements of the country to be visited, citizens of the United States need to carry a passport that is valid for six months beyond the visit or documented evidence of their citizenship and identity (身份). In addition to a passport, some countries will require a visa. For more information, see Visa and Foreign Entry Requirements.
Current information on passports is available at the Department of State Passport Services and Information website. There is a new passport requirement for U.S. citizens traveling between the United States and the rest of the Western Hemisphere (半球). For details, see Western Hemisphere Travel Initiative.
When traveling to some specified countries, U.S. citizens may be subject to restrictions on publishing, the exchange of information, the sponsorship of conferences, etc.

A:the importance of applying for a passport and visa B:safety regulations for visiting other countries C:the limitations to traveling around the world D:the requirements for their traveling abroad

Whether you are an American citizen or a foreign national living in the United States, travel abroad requires preparation. Travel may be for the purpose of attending meetings or activities in other countries, visiting families or simply taking a vacation. This page is intended to provide guidance and useful resources.
What information do U.S. citizens need
Depending upon the requirements of the country to be visited, citizens of the United States need to carry a passport that is valid for six months beyond the visit or documented evidence of their citizenship and identity (身份). In addition to a passport, some countries will require a visa. For more information, see Visa and Foreign Entry Requirements.
Current information on passports is available at the Department of State Passport Services and Information website. There is a new passport requirement for U.S. citizens traveling between the United States and the rest of the Western Hemisphere (半球). For details, see Western Hemisphere Travel Initiative.
When traveling to some specified countries, U.S. citizens may be subject to restrictions on publishing, the exchange of information, the sponsorship of conferences, etc.

A:to get a visa is a new requirement for American citizens visiting other countries B:it’s easier for American citizens to get a visa from a foreign country than at home C:requirements for American citizens going abroad are not always fixed D:American citizens usually have difficulty getting a passport

The rest of his life is （　） to the cause of international exchange of visiting scholars.（　）

A:added B:put C:saved D:committed

I like visiting Switzerland but it is getting ______ and more expensive.

A:harder B:worse C:more D:nicer

The rest of his life is ______ to the cause of international exchange of visiting scholars.

A:added B:put C:saved D:committed

Thousands of people in the city ______ to welcome the visiting guests.

A:turned off B:truned up C:truned out D:turned over

Visiting Moscow was great but the temperature was 25 ______ freezing.

A:under B:above C:below D:up

Visiting Moscow was great but the temperature was 25 ______ freezing.

A:under B:above C:below D:up