—What led to his success ?—He succeed _____ working hard .
54. Because of the year 2008 Olympic Games, the American corporation board of trustees(董事会) decided to set up a Chinese _____ in Beijing.
55. All ____ not baked in one oven. (prov.)
56. He said under his breath that he would keep the secret. The underlined part means _____.
57. The rain was coming down in buckets. This sentence means ____ .
58. The little boy has learned many Tang dynasty poems _____ though he is very young.