轮船、鸭子能漂在水面上，这是因为它们受到了水的______作用．在水中下沉的物体

Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each bank with the word or phrase that best fits the context.
As Christmas drew near, Ursula was faced with just that problem. She had come to live in an American home and learn English.  50 , she would mind the children and do anything she was asked.
One of her tasks was to keep track of   51 Christmas presents. Ursula did this faithfully, but she became increasingly worried. What could she buy for her   52 with the little money she had that would compare with the gifts she was recording daily?  53 ,even without any of the gifts , her employer seems to have everything.
Ursula _ 54 _ long and hard. On Christmas Eve, she went to a store. She moved slowly through crowds of shoppers,   55 things in her mind. Finally she bought a baby dress. She immediately called   56  . “Excuse me, please, can you help me find a poor family with a baby?”  “A poor family?” said the   57  driver. “Yes, a very poor family.” Ursula told the man of what she was trying to do. He   58 in silence, and then said, “I know a family who   59 just about everything.”

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When they reached a   60 the driver said, “They live on the third floor.” Ursula shook her head, “Would you take this dress to them and tell them it’s from someone …someone who has everything.”

Early the next day, Ursula   61 everyone for the presents she received. Then, she began to      62  why there seemed to be none from her. She told about what she did the night before. When she finished, there was a long   63 . “You see,” she added, “I try to do a kindness in your   64 . And this is my Christmas present to you.”
50. A. In return         B. As a result             C. By the way           D. In a sense
51. A. delivering        B. mailing                 C. arriving                D. sending
52. A. American family B. own family       C. friends                 D. classmates
53. A. Otherwise       B. Therefore             C. Besides                D. However
54. A. talked             B. worked                C. waited                 D. thought
55. A. selecting         B. matching              C. remembering        D. organizing
56. A. a shop            B. a taxi                   C. her employer        D. her parents
57. A. delighted        B. anxious                 C. surprised              D. respectful
58. A. noticed           B. listened                C. got out                 D. carried on
59. A. buys               B. has                      C. uses                     D. needs
60. A. garage            B. building               C. station                 D. yard
61. A. thanked          B. encouraged           C. praised                 D. admired
62. A. settle              B. repeat                  C. argue                   D. explain
63. A. delay              B. silence                 C. time                    D. break
64. A. case               B. opinion                C. memory               D. name