请根据句子逻辑, 从模块二课本所学的词汇中选用恰当的单词并且使用其正确的形式填空。

81．Only those who were born in Greece could be a_____________ as competitors in the Ancient Olympic Games.

82．If you want to sell your books, put an a_________ in the newspaper.

83．The number of participants has d_________ to 50, which we didn’t expect.

84．My uncle has a valuable mirror designed and d__________　in the fancy style of the Song Dynasty.

85．I would a_____________ it if you could do me a favour.

86．According to Darwin, who is famous for his theory of evolution（进化理论）, all creatures are subject to（受制于）the principle of natural s__________.

87．You had better s_______ the steps of operating the machine so that every body can learn them quickly and accurately（准确地）.

88．The football match between Arsenal and Manchester United will be b_________ live this evening.

89．Learning to play a kind of musical instrument can make you more i_________(聪明).

90．Whoever breaks the window should take the r___________________ and should pay for it.