第四部分：根据句意及所给首字母，填入一个合适的单词。(共10小题，每小题0.5分，满分5分)

71. At last he was p____________ to take his brother’s advice.

72. A stay in the country will be b______________ to his health.

73. They decided to buy some new e_____________ for the lab.

74. A customer was talking with the manager, with their hands c_________.

75. You don’t seem very e______________ about the suggestion.

76. They are looking forward to a___________ that old play to their needs.

77. She is not generous at all. She is always m_________ with her money.

78. D___________ to his research, he always forgets to have dinner.

79. The lack of rain could s__________ disaster for farmers.

80. Speech and writing are man’s most important methods of c____________.