首先谢谢8老师，前些天问过我儿子的事，今天还有一些。
情况1：如果我儿子的女朋友/未婚妻以B2签证来美国，然后我儿子在一个月后申请K1签证，
然后她就回中国了。请问在等待K1签证期间，我儿子的未婚妻还可以用B2签证进出美国吗？
situation1: If my son's girlfriend comes into USA via B1 visa, they meet and like each other,
then my son applies K1 Visa. she then returns to China after 2 months. Can she
still come into USA during the time waiting for her K1 visa?
情况2：如果我儿子的女朋友/未婚妻以B2旅游签证来美，和我儿子在2个月内结婚，
3个月后她就回中国了。然后我儿子申请CR1/K3签证，请问在等待CR1/K3签证期间，
她还可以用B2签证进出美国吗？
Situation 2: If my son's girlfriend/fiancée comes to USA via B1 visa, then they get married
within 60 days, then she returns to China. Can she come to USA during the time waiting for
her CR1 or K3 visa?