根据下列句子首字母及所给汉语注释，在横线上写出各单词的正确形式，并将答案写在答题卡上。

小题1:Just at that time, I began to s_______________ (怀疑) whether to tell her that matter.

小题2:There was a c_______________ (冲突) between the accounts of the witnesses.

小题3:And today’s difficulty will not be t_______________ (暂时的).

小题4:The final between Spain and Italy made a deep i_______________ (印象) on the football fans.

小题5:High fever is only a s_______________ (症状) of this kind of disease, not a cause.

小题6:You must have a s _______________ (确切的；特定的) aim if you want to go to college.

小题7:The crowd a_______________ (前进)towards the gates of the palace.

小题8:The girl was so happy to find a v_______________(多样性) of flowers in the garden.

小题9:His explanations were too c_______________ (复杂的).

小题10:My parents do not a_______________ (批准，赞成) of my staying up late.

下列哪一项属于分析性研究（）。

A.病例一对照研究

B.临床试验

C.生态学研究

D.社区干预试验

E.以上都不是