20．A.value B．worthwhile

　　C．worth D．worthy

　　解析：选C。根据上文可知一个成功的采访需要提前做一些功课，这是非常值得的。be worth it意为"是值得的"，为固定搭配。故选C项。

　　Ⅱ.语法填空

　　In his heyday pop star Rod Stewart had thousands of girls screaming and crying at his concerts. And years 1.____________(late) his emotive power still existed as a little girl cried and laughed when her mother sang one of his 1988 hits to her.

　　A video 2.____________ recorded the moment 3.________(post)on YouTube and showed the 10­month­old baby going through a range of emotions as her mother sang My Heart Can't Tell You No. It started 4.________ the smiling baby sitting in a baby chair as her mother asked，"Do you want mummy 5.____________(sing)a song? Let me know 6.____________ you feel about this song."

　　As the mother began to sing, the baby looked 7.____________(puzzle)and then broke into a wide smile as she continued.8.____________ then her eyes started to fill up with tears and she frowned. Salty tears rolled down her cheeks into her mouth and she paused to taste 9.____________ before looking more upset. But just as suddenly she then smiled wide and looked as if she was enjoying the song again. When the mother finished and told the little girl "It's just a song"， she then laughed 10.____________(happy)．

　　【语篇导读】　一首歌曲会产生令人惊讶的效果。

　　1．later　later表示"以后"。

　　2．which/that　which/that引导的是一个定语从句，修饰video，且在从句中作主语。

　　3．was posted　由上下文可知，此处描述的是过去的事情，且post与主语a video之间是被动关系，应用一般过去时的被动语态。

　　4．with　start with以......开始。

　　5．to sing　want sb. to do sth.不定式作宾语补足语。

　　6．how　句意：让我知道你对这首歌有什么样的感觉。how如何，怎样。

　　7．puzzled　puzzled迷惑不解的。

　　8．But　上下文之间是转折关系，应用连词but表转折。

　　9．them　代替上文的tears，应用them。

　　10．happily　副词修饰动词laughed。

　　Ⅲ.短文改错

(2017·云南玉溪一中月考)Frank joined the army after middle school. He did quite well in everything besides shooting. One day, the new soldiers were practiced shooting. Frank performed poorly while the rest was doing quite well.After he had shot at the target nine times but had not hit once, the officer shouted，"I had never seen such a fool! Don't waste away your last bullet! Go