根据下列各句句意及所给单词的首字母或汉语提示，用正确形式的单词填空。并把完整单词填写在答题卷相应的位置上。

小题1:The old woman c_______ to the police about the noise downstairs, which prevented her from sleeping at night.

小题2:Terrorists planned to make the two planes c_______ in the U.S.A. but failed.

小题3:He won the match and I went over to give him my sincere c__________.

小题4:It is generally accepted that the dove (鸽子) is the s_______ of peace.

小题5:Scientists have to do lots of s_______ researches before they draw a conclusion.

小题6:The video, which _______ (结合) singing and dancing, is popular with students.

小题7:In the summer holiday, I will visit some _______ (历史的) sites in Nanjing.

小题8:_______ (幸运的是), there are still five minutes left before the class.

小题9:The Mid-Autumn Festival is a special _______ (场合) for family.

小题10:On an _______ (极端地) cold night, the poor girl froze to death on the street.