55. _____ the silkworm produces a fluid internally and then forces it out through tiny holes in its body.

　　A) It makes silk and

　　B) Making silk

　　C) To make silk

　　D) Silk is made by

　　56. _____, we went swimming.

　　A) The day being hot

　　B) It was a hot day

　　C) Being a hot day

　　D) Owing to a hot day

　　57. _____ in a recent science competition, three individuals were awarded scholarships totaling '36,000.

　　A) Judged the best

　　B) Judging for the best

　　C) Judging the best

　　D) Having judged the best

　　58. Some days go by much more quickly than others. Some hours as if they _____.

　　A) would never end

　　B) should never end

　　C) will never end

　　D) might never end

　　59. John would never have gone to the hospital _____ that Tom would be there, too.

　　A) he did not know

　　B) if had he known

　　C) had he known

　　D) he would have known

　　60. _____ he suggested was the sharing of the cost among all the five.

　　A) That

　　B) Which

　　C) What

　　D) Whatever