根据下列各句句意，写出括号内单词的正确形式（每空1分，共10分）
Poverty, disease and ignorance remain major world problems. It is not a question that can be__________________.  ( ignore )
I was very _______________ to my teachers for their help and my gratitude to them was beyond words. ( grate )
While ________________ in the street, he happened to meet one of his friends.  ( walk )
My mother is the ________________ friend of mine.  ( good )
Both of us are interested in _______________________.  ( cycle )
Yesterday, the officer was _________________ approved ( 批准 ) that he could have a two- month holiday and he said he would spend his holiday with his old father.  ( office )
She is a _______________ woman who always gets what she wants. ( determine )
I will never forget the ________________ of the boss.  ( cruel )
I don’t think it fair to let them know the topic in advance （提前）. No, it’s _______ ( fair )
The storm destroyed many houses, and the _______________ of the railway was the biggest loss in the storm, which was the most destructive in 30 years. ( destroy )