回顾我们所走过的社会主义建设的路程，可以看出，经济发展水平的每一次跃升，都源于改革理论的突破，都源于解放思想、实事求是的思想路线。正如闪电走在雷鸣前一样，思想要走在行动前面。“思想要走在行动的前面”包含的哲理是                              

A．一定形态的思想是一定形态的经济和政治的反映

B．一定形态的思想反作用于一定形态的经济和政治

C．一定形态的思想决定一定形态的经济和政治

D．一定形态的经济和政治决定一定形态的思想

根据句意，用括号内所给单词的适当形式填空。

小题1:The problem is so easy that I have no difficulty        (explain) it to my classmates.

小题2:If you tell him the            (true)，he will be angry.

小题3:You may ask your teacher for help. He will give you a few        (value) suggestions.

小题4:People in the past suffered from hunger and         (ill).

小题5:I invited Sally to my party, but she refused         (accept) my invitation.