It has become a (grow) ____ cultural, commercial and tourist center.
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There is a (mix) _____ of many different nationalities in America.
The newly coming manager has enriched working (experience) _____ in the realm of sales.
But when you go (close) ____ , you can see 1,888 photos of Chinese people.
_________________,用于返回对拥有指定id的第一个对象的引用。