一、给每个词添加合适的前缀，使新词与原词词义相反
1. correct 2. tidy
3. usual 4. possible
5. patient 6. healthy
7. comfortable 8. happy

1. incorrect 2. untidy 3. unusual 4. impossible
5. impatient 6. unhealthy 7. uncomfortable 8. unhappy

【分析】本题考查英语中通过添加否定前缀构成反义词的用法，解题思路为：先回忆常见的表示否定意义的前缀（如in-、un-、im-等），再结合每个原词的拼写特点，选择合适的前缀添加，使新词与原词词义相反。例如，correct以辅音字母c开头，常用否定前缀in-构成反义词incorrect；tidy则用前缀un-构成untidy，以此类推，逐个对应原词添加合适前缀即可。
【解析】1. 在correct前加否定前缀in-，得到incorrect；2. 在tidy前加否定前缀un-，得到untidy；3. 在usual前加否定前缀un-，得到unusual；4. 在possible前加否定前缀im-，得到impossible；5. 在patient前加否定前缀im-，得到impatient；6. 在healthy前加否定前缀un-，得到unhealthy；7. 在comfortable前加否定前缀un-，得到uncomfortable；8. 在happy前加否定前缀un-，得到unhappy。
【答案】1. incorrect 2. untidy 3. unusual 4. impossible 5. impatient 6. unhealthy 7. uncomfortable 8. unhappy
【知识点】英语前缀（构成反义词）、词汇的反义词
【点评】本题为基础词汇题型，考察常见否定前缀的用法，属于英语词汇积累的基础内容，难度较低，只要掌握常见否定前缀的用法即可轻松解答，有助于巩固基础词汇。
【难度系数】0.8

二、根据句意，用括号中所给形容词的正确形式填空
1. Tom had an (lucky) day because he lost his wallet on his way to work.
2. He knows little English and he can only say some (complete) sentences.
3. It is (polite) to ask someone's age and marriage when you meet for the first time.
4. Today's talk was (interesting). I felt bored and nearly fell asleep.
5. After retiring (退休), my grandpa became a little (active). He spent more time sleeping.
6. The work of art is (perfect), but that's why it is unique (唯一的).
7. The new neighbour seems a bit (friendly). He never greets others.

1. unlucky 2. incomplete 3. impolite 4. uninteresting
5. inactive 6. imperfect 7. unfriendly

【分析】首先通读每个句子理解句意，判断括号内形容词需使用其反义词；接着回忆常见形容词的否定前缀规则（如lucky用un-、complete用in-、polite用im-等），结合句意选择正确的否定形式填入空格。
【解析】1. 由“丢钱包”可知是不幸的，lucky的否定形式为unlucky，故填unlucky；2. 由“几乎不懂英语”可知是不完整的句子，complete的否定形式为incomplete，故填incomplete；3. 由常识可知初次见面问年龄婚姻是不礼貌的，polite的否定形式为impolite，故填impolite；4. 由“觉得无聊差点睡着”可知谈话无趣，interesting的否定形式为uninteresting，故填uninteresting；5. 由“花更多时间睡觉”可知不活跃，active的否定形式为inactive，故填inactive；6. 由转折连词but可知是不完美的，perfect的否定形式为imperfect，故填imperfect；7. 由“从不和别人打招呼”可知不友好，friendly的否定形式为unfriendly，故填unfriendly。
【答案】1. unlucky 2. incomplete 3. impolite 4. uninteresting 5. inactive 6. imperfect 7. unfriendly
【知识点】形容词的否定前缀用法、形容词的正确形式填空
【点评】本题考查形容词的否定形式，需结合句意判断所需反义词，掌握常见否定前缀即可解答，属于基础题型，适合初中学生练习。
【难度系数】0.8

三、用方框中所给单词的正确形式填空，补全短文
able possible sure expensive correct
Last Sunday, I got the crazy idea of making crème brûlée (焦糖布丁) by myself at home, thinking it would be simple and fun.
I didn't have much money, so I went to the supermarket and picked up some (1) materials, such as milk, eggs and sugar. I got started after watching a few teaching videos online.
Things quickly went wrong because I was (2) how much sugar to add. Then, I put in a(n) (3) amount. Later I realized the mistake made my crème brûlée too sweet.
When I heated the milk, I answered a phone call. By the time I got back to the stove, the milk had a burnt smell. It was (4) to be the perfect dessert. I had to start over again.
Finally, I set the wrong temperature when putting the materials into the oven to bake, so I was (5) to get the smooth texture (口感) all the time.
Even though my first try didn't work, I learnt a lot. Next time, I will be more careful and follow the instructions step by step.

1. inexpensive 2. unsure 3. incorrect 4. impossible 5. unable

【分析】
解题思路：首先明确方框内单词的含义（able：能够；possible：可能的；sure：确定的；expensive：昂贵的；correct：正确的），再结合每个空的上下文语境，选择合适的单词并根据语义调整为对应的反义词形式（句子逻辑多需否定含义），同时注意词性匹配（修饰名词用形容词，搭配be动词后用形容词）。
【解析】
1. 前文提到“我没有太多钱”，需用表“不贵的”的形容词修饰materials，故将expensive变为其反义词inexpensive；
2. 后文提到“不知道加多少糖”，对应“不确定的”，故将sure变为其反义词unsure，构成be unsure结构；
3. 后文提到“布丁太甜”，说明加了“错误的”量，故将correct变为其反义词incorrect修饰amount；
4. 前文提到“牛奶有糊味”，因此不可能成为完美甜点，故将possible变为其反义词impossible；
5. 前文提到“设置了错误的温度”，因此“不能得到顺滑口感”，故将able变为其反义词unable，构成be unable to结构。
【答案】
1. inexpensive 2. unsure 3. incorrect 4. impossible 5. unable
【知识点】
形容词反义词运用、语境词汇填空、固定搭配
【点评】
本题为语境填词题，重点考察形容词的反义词变形及在具体语境中的词汇运用，需结合上下文逻辑判断词汇含义，难度适中，学生理清语境和单词变形规则即可完成作答。
【难度系数】
0.5