Ostensibly means apparently
Immensity means vastness
Embodied means personified
Deferred means postponed
The correct sentence is: Two of the best singers were them. This makes sense because when you rephrase the sentence, "them" becomes "they" which appropriately describes the nouns of the sentence. The modified sentence then becomes: They were the best singers.
Hmm..
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The pipa is mainly used in Chinese music.