单词拼写（共10小题；每小题1分，满分10分）

根据题中所给的首字母写出符合句意的单词的正确形式。

71. This kind of drug can p_________ children from mosquitoes.

72. The noise outside a__________ our study.

73. Tom works so hard, so he will s_________ sooner or later.

74. There are many kinds of i_________ in the world, a bee is one kind of them.

75. Sea water c__________ salt.

76. You will e__________ your health if you work so hard.

77. She prefers pop music and jazz to c__________ music.

78. A m__________ is a person who performs or writes music, especially as his/her job.

79. Police asked some p__________ to get some evidence about the accident happened just now.

80. The group of popular singers will give another two p__________ before leaving China.

进口付款保函与银行开出的信用证作用完全相同。