回复:关于HIB AND H4 EXTENSION, 急盼回复!

1. not sure.
2. yes, i539 is the only form and indeed you need paying $300. see http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=94d12c1a6855d010VgnVCM10000048f3d6a1RCRD
3. personal check should be OK

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