回答

(1)It was, that :you (強調構文)
(2)did : eat (動詞の強調)
(3)much : easier (比較の強調)
(4)It was that : at the store (強調構文)
(5)by far : the fastest (比較の強調)
(6)It was that : this book (強調構文)
(7)himself : He
(8)Do : be (quiet) (命令文)
(9)on earth : What (on earth:いったい)
(10)at all : know ((否定文で)at all: 全く〜ない)

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