Questios for travel to China

My hu*****and’s H1B will be expired on Augest this year. But his 140 於 1/12/06 寄了出去, I want to back to china for three months during June and September. My current status is H4, 現在請教各位同胞：
Can I get a H4 visa in Beijing for me to return to USA on September during my hu*****and’s 140 pending?
When can I apply for 回鄉證?
How soon can I get it?
Can I back to china with H4 and Return to USA with 回鄉證 which my hu*****and send to me by mail when he get it in USA.
Thanks