请帮助解答以下英文填空

请帮助解答以下英文填空
Fill in the blanks by using the above words.
1.The                          cause of his success is his ability to work for long hours without feeling tired.
2.The board is making the                         decision.
3.The letter should be marked “              “,otherwise,my secretary may read it.
4.Your advice will be very                           to me.
5.He arrived at the                   moment.
6.Everybody should have good                          training before he starts to work in this factory.
7.We had a very                         holiday on the beach and everybody was looking forward to the next one on the island.
8.You must first determine the                         idea of the article you are going to write and then seek for materials about it.
9.I was told that                        cameras could make much clearer pictures.
10.As far as the                         market is concerned,we are improving our sales.
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