Help on B-1 visa

My sister just got a B-1 visa to visit me. Except married to a citizen, are there any other ways to stay longer in US ? Is it easy to convert B-1 to F-1 visa or H-1 visa now ?
Thanks in advance.

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回复:Help on B-1 visa -mytwocents- 给 mytwocents 发送悄悄话 (263 bytes) () 02/10/2006 postreply 14:21:33

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