1. 【答案】official

【解析】the show’s official website 该节目官方网站。官网official website，故答案为official

2. 【答案】However

【解析】However, these are often only viewable to Internet users located within the United States. 然而，这些常常只能是美国境内的网络用户才能看见。修饰整句话，用副词，故答案为However

3. 【答案】often

【解析】these are often only viewable to Internet users located within the United States. 这些常常只能是美国境内的网络用户才能看见。修饰形容词viewable用副词，故答案为often

4. 【答案】keep

【解析】allows users to keep the video content 允许用户保存视频内容。allow sb to do允许某人做某事，用动词原形，故答案为keep

5. 【答案】computers

【解析】keep the video content on their computers, 将视频内容保存在电脑上。their后面接名词，故答案为computers

6. 【答案】popular

【解析】 the most popular method 最流行的方式。修饰名词method用形容词，故答案为popular

7. 【答案】benefits

【解析】The major benefits of Internet TV 网络电视最主要的好处。the后面接名词或名词词组，故答案为benefits

8. 【答案】flexibility

【解析】 include programming selection and flexibility. 包括节目的选择性和灵活性。and一般连接前后相同词性，这里连接名词短语programming selection和名词flexibility，故答案为flexibility

9. 【答案】select

【解析】Internet TV users can select virtually any program 网络电视用户几乎能够选择任何节目。can后面接动词原形，故答案为select

10. 【答案】given

【解析】 at any given time 在任何给定的时间。这是个固定表达，直接记。，故答案为given

11. 【答案】order

【解析】in order to pause, rewind or fast forward 为了暂停、倒回或者快进。词组in order to do为了做某事，故答案为order

12. 【答案】capabilities

【解析】these capabilities  with Internet TV 网络电视的这些功能。名词复数，因为these，故答案为capabilities