You can renew after your vacation but make sure you enter in to the country before your passport expires. They will cancel all pages of your passport except the once have valid VISAs.
1. no need.
2. usually no questopns, just show new I-797 to the officer at POE.
3. yes he will. your visa in the passport is to get in to the country and your new I-797 proves your status in the country.
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