题目

The other day, my husband    16    (劝)me to buy    17    (保险)for our journey to    18  (新加坡).I had      19    (决心)to make a sea     20    (航行)to an island country, which I    21  (偏爱)ever since I was a little girl. My husband finally    22    (改变主意) and his work    23   (时间表). His      24   (态度)changed so greatly that I felt it a great surprise. I     25   (表达)my thanks to him but asked him to wait for my daughter's graduation till June 10.已知函数=        .