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8老师，再请教您一个1-131 的问题

Part 7: how many times trips do you intend to use this document? Will it make a difference if I choose 'one trip' vs 'more than one trip'? My parents want to go back china after they get the advance parole even they don't have their greencard approvals. In the worst scenario, they can use advance parole for multiple travels if they don't have their greencard on time. 

BTW, the advance parole is valid for one year, correct? Most likely we should have greencard approved within a year. If not, can we reapply for advance parole after the first one gets expired?

Many many thanks!!!