1. May I have your attentions, please? (x)
May I have your attention, please? (√)
attention作“注意(力)”解时，是不可数名词。若指对异性“献殷勤” ,则常用复数形式attentions，如:I'm fed up with his attentions.(我受不了他对我直献殷勤。)
2. Children usually have a short attentive span.(x)
Children usually have a short attention span. (√)
attentive是形容词，意为“专注(听讲)的”，如:an attentive audience就是指一群专心听讲的听众。这个词只能形容人，不能形容事物。attention span是指“专注的一段时间”，为固定用法。
3. The TV show attracted millions of spectators.(x)
The TV show attracted an audience of millions. (√)
spectator通常是指“到现场看比赛或其他活动的观众”，如:The spectators at the boxing match are all very excited(看这场拳击赛的观众都很亢奋。)audience本身是集合名词，专指一群看电影/电视或听演讲的观众。另外，专指看电视的观众还可以用viewers)这个词。
4. I'd like to become an author.(x)
I'd like to become a writer. (√)
author专指已有作品发表或出版的作者“本人”，通常须用形容词(词组)加以限定，如:He has become a famous author.(他己经成为一个名作家。)或She is the author of 16 best-sellers.(她是16本畅销书的作者。)单指作家的“身份”时，用write这个词。
5. None of us dare question his authorities.(x)
None of us dare question his authority. (√)
authority作“权威/权势”解时，是不可数名词;作“权威人物”解时，是可数名词，如:Mr. Murphy is an authority on pathology.(墨菲先生是病理学的权威。)指“主管当局”时，用the authorities，如:The health authorities have adopted drastic measures to fight against SARS.(卫生主管当局已经采取强硬措施来对抗SARS。)
6. Amy's performance tonight is above the average.(x)
Amy's performance tonight is above average.(√)
be above / about / below average意为“水准以上/左右/以下”.是固定用法，average前不加冠词。至于the / an average，通常要接名词或of+名词于其后，如:The average temperature in Shanghai last month was 28C.(上海上个月的平均气温是28C。) 或I spend an average of 2.000 dollars on books per month.(我平均每月花两千美元买书。)
7. The government has taken action to avoid the spread of bird flu.(x)
The government has taken action to prevent the spread of bird flu. (√)
avoid是“避开”或“刻意不去做某事”的意思，如:Avoid the park after dark.(天黑后别去那个公园。)Try to avoid exposing your skin to the sun.(尽量避免将你的皮肤暴露在阳光下。)prevent + N 或 prevent sb / sth from V-ing是“阻止/防止某事发生”的意思。
8. Before the alarm clock went off, I was akeady widely awake.(x)
Before the alarm clock went off, I was already wide awake. (√)
be wide awake=be completely awake，是“完全清醒”的意思，固定用法。
9. The reward for this year's best actor went to Tom Cruise.(x)
The award for this year's best actor went to Tom Cruise. (√)
reward是“酬劳”的意思，如:He was given a reward for helping the police solve the crime.(他因帮助警方破案而获得一笔酬劳。) award是某人因表现杰出而获颁的“奖项”。
10. The wedding is only two weeks to come.(x)
The wedding is only two weeks away. (√)
three weeks / two days away 表“再过三星期/两天就到了”，为固定用法。