回答

(1) I think she is (not so much a genius as an industrious) person. ※not so much A as B AというよりむしろB 不要:but
(2) A (little exercise of imagination will tell you how important the) law is.
(3) The (driver kept the engine running while we waited) for Susan.
(4) (Technology has changed the way people correspond). 不要:how
(5) It (was not until 12 p.m. that we could return to) our rooms. 私達が部屋に戻れたのは午後12時だった。
(6) He stood (still as if he were a dead man).
(7) You can't (go to that shop without meeting someone you) know. ※not ~ without …ing ~すると必ず…する
(8) Only on (a few occasions <would he ever>) think to wear that very expensive suit. ※only+<倒置>(=疑問文の語順)
彼がその非常に高価なスーツを着ようと思ったのは、ほんの数回だけだった。

参考にしてください。

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