C）根据对话内容，从下面方框中选择适当的单词或短语填空，使对话内容完整正确。

Tom： I give up! I____ can't learn English!
Amy:  Why do you say that? I think you are making a lot of____ .
Tom:  No, I'm not. I try and try and I still can't speak it very well.
Amy:  Learning any language ____  a lot of effort. Please don't give up.
Tom:  Amy, I know you always____ English. Can you offer me some valuable advice?
Amy:  Listening to English tapes and watching English movies may be helpful. But always remember your English will improve if you are really____ it.
Tom:  Good idea. I will try to love English.

下列关于黄赤交角的描述，正确的是（    ）

公元前487年，执政官不再经过选举，而是由抽签产生，但只准第一，二等级任执政官的限制仍然有效。到公元前457年，公民大会决定可让第三等级公民任执政官，后来又扩大到第四等级，并一律由抽签产生。当时，这种做法（    ）

____ .