阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

Opportunities don't come often．They come every once in a while．Very often, they come quietly and go by without 1________(notice)．Therefore, it is advisable that you should 2________(valuable)and treat them with care．When 3________ opportunity comes, it brings a promise but never realizes it on 4________ own．If you want to achieve something or intend to fulfill one of your ambitions, you must work hard, make efforts and get prepared．Otherwise, you will take no advantage of opportunities when they come to visit you．The difference between a man who succeeds 5________ one who does not lies only 6________ the way each treats opportunities．The successful person always makes adequate preparations to meet opportunities as they duly arrive．The 7________(success)person, on the other hand, works little and just waits to see them pass 8________．In my opinion, there are plenty of opportunities for everyone in our society, 9________ only those who are prepared adequately and qualified highly can make use of them 10________ achieve their purpose．

1．________；2．________；3．________；4．________；5．________；

6．________；7．________；8．________；9．________；10．________