I will give lectures in China for 4 days in May, and then I will return to the USA, so I will be applying for a business visa. However, there is a chance I will be able to return to China again some time during the next year. May I apply for a multiple entry visa? Or because I have an invitation for only one visit should I apply only for a single entry visa? I would like not to have to pay the visa fees twice if I get the chance to return. Thanks.