2．The broader the boat is, ____________ (safe)it is in bad weather.

　　答案：the safer　句意：船越宽，在恶劣的天气里就越安全。"the＋比较级，the＋比较级"结构表示"越......越......"，为固定用法，符合题意。

　　3．-No one ____________ be compared with Yao Ming in playing basketball.

　　-Oh, you are really his big fan.

　　答案：can　考查情态动词。句意：--在打篮球方面没人比得上姚明。--哦，你真是他的铁杆粉丝。can能够，符合句意。

　　4．____________ (look) at my classmates' faces, I read the same excitement in their eyes.

　　答案：Looking　考查非谓语动词的用法。动词"look"与句子的主语"I"之间为主谓关系，所以用现在分词。

　　5．____________ well prepared a gymnast is, he still needs a lot of luck in performing.

　　答案：However/No matter how　句意：无论一个体操运动员准备得多充分，在比赛中仍然需要很多运气。此处however＝no matter how"无论多么"，引导让步状语从句。

　　6．The scientist was rewarded by the government for ____________ (make) such a great contribution to the country.

　　答案：having made　句意：那个科学家因对国家做出了巨大的贡献而被政府授奖。介词for后应跟动名词，而做出了巨大的贡献是发生在主句动作之前，故用having made。

　　7．During the last three decades, the number of people participating in physical fit ness programs ____________ (increase) sharply.

答案：has increased　考查时态。句意：近30年来，参加健身活动的人数一直在急剧增加。during the last three decades近30年来，这是包括现在时间