Sentence:  Everything he had seen so far &mdash; the great chocolate river, the waterfall, the huge sucking pipes, the candy meadows, the Oompa-Loompas, the beautiful pink boat, and most of all, Mr. Willy Wonka himself &mdash; had been so astonishing that he began to wonder whether there could possibly be any more <WSD>astonishments</WSD> left. 
Meaning of the word marked with <WSD> tags:  An amazing thing or phenomenon.