根据句意和汉语提示写出单词，完成句子。

81.Red will influence you when you make a ______________(选择).

82. Last Friday ,they _______(取消) the sports meeting because of the bad  weather.

83.I am wondering which is _________(安全), traveling by train or by air.

84.Steve Jobs was a great_________ (先锋,开拓者). And because of his great success, Apple can go further.

85.The whole world was surprised at many_______ (成就)of China these years.

根据句意，用所给单词的适当形式填空。

86.To be a successful man doesn’t just mean to be a _________(wealth) man.

87. Five ________(twelve) of the population in this factory are women.

88.Everyone should make a contribution to ___________ (protect) the environment.

89.I think watching table tennis match is ___________(simple) a waste of time. Why not take a walk in the garden, dear?

90.What great problems they have __________( pronounce) the word correctly.