The site also notes that a visa-waiver program for Singaporean passport holders traveling to China for 15 days or less will be temporarily suspended, effective July 1.

该网站还指出，新加坡护照持有者到中国旅行15天以内的免签证做法将从7月1日起暂时停止。

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Of course, the Bulgarian citizens are expecting your decision on Bulgaria's joining the Visa Waiver Program.

WHITEHOUSE: President Obama's Bilateral Meeting with Prime Minister Boyko Borissov of Bulgaria | The White House

One way to easily expedite the visa process is to add Brazil, Chile, Poland and other countries to the Visa Waiver Program.

FORBES: Destination: USA

The main reason why the U.S. does not include Brazil in the visa waiver program list is to avoid a flow of Brazilian immigrants.

FORBES: Why The US Should Include Brazil In The Visa Waiver Program