右图既可以看成正在对视的两个人，也可以看成一个酒杯。这表明( )
He observed a stranger _______ around the store at 12 p.m. last night.
Once ______ , the plan can’t be changed.
They asked me so many ______ questions that I got ______.
Jumping out of ______ airplane at ten thousand feet is quit ____ exciting experience.
Occasions are quite rare ______ I have the time to spend a day with my kids.
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