根据下列句子及所给汉语注释，写出空缺处各单词的正确形式。(每空只写一词)

71. Make sure that all the windows are securely _______(栓牢) before you leave.

72. You can just wear your casual clothes to the party because it is a(n) ______ (非正式的)party.

73. On his ______（到达）in Beijing, he went to a restaurant to treat himself to roasted duck.

74. I _______(认领)the coat that the teacher found.    

75. I changed into my sports shoes so that I could walk more _______(舒服).

76. The new secretary is a quick, _____(高效的) worker, and the boss is quite satisfied with her.

77. The dog waited _______(怀着希望地)beside the table for some food.

78. After much deliberation, the president decided to ______(采纳) her suggestion.

79. A ________ (扣子)has come off his coat. 

80.The exhibition has received a positive _______(反应) from visitors.