核心词汇
1.Her strength of will was ____________(异常的；非凡的)．
2．This is an ____________(极其地)difficult task.
3．The National Day was celebrated t____________ the country.
4．The ____________(结合；联合体)of the 50 states forms the United States of America.
5．They said that they ____________(作为……的代表)the committee.
6．The i____________ of the fingerprints on the gun proved that he was the killer.
