题目

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                  

提问时间：2021-02-25

答案