7．Obviously 解析 考查词性转换。副词作状语修饰整个句子。
8．worse 解析 考查比较等级。句意：走动让他的哮喘更严重了。even 后用比较级，表示程度上更进一步。
9．who/that 解析 考查连词。先行词是人，引导词在定语从句中作主语，故用who/that 引导。
10．to buy 解析 考查非谓语动词。want 后一般用不定式作宾语，表示主动意义。 Ⅲ.短文改错
I am angry about the behavior of ∧being /dishonest dishonesty
① in exams. I'm not saying that I'm a good student and or ② that I've never cheated. I once write wrote
③ the answers on my hand for a history test but, unluckily, ∧was ④ caught by my teacher. Because
she was one of my most ⑤ favorites, there were no words to describe how sorry I felt
at once. I thought cheat cheating
⑥ would help me keep my straight A's. Little ∧did ⑦ I know that I was hurting not only herself myself
⑧ but also my teacher. From this lesson I know our teachers want their students to succeed by learning with on ⑨ their own and do doing
⑩ the best they can, not by cheating.
① 解析 介词后接名词或动名词。
② 解析 句意：我不是说我是好学生，我从来不作弊。在否定句中表示并列的连词用or 。
③ 解析 句意：我曾经在历史考试中将答案写在手上。讲述的是过去的事情，故用一般过去时。
④ 解析 此处主语I 和谓语catch 是动宾关系，故用被动语态。
⑤ 解析 favorites 已经有最高级的含义。
⑥ 解析 句意：我本以为作弊会让我一直得成绩全优。用动名词作从句的主语。 ⑦ 解析 Little 位于句首时，句子用部分倒装，且时态为一般过去时，故用did 。 ⑧ 解析 主语是I ，动作反及本身用myself 。
⑨ 解析 on one's own 靠某人自己。
⑩ 解析 此处doing 与learning 并列作by 的宾语。
Ⅳ.书面表达
假定你是李华， David 是你的美国笔友。他对你校将开设的一些选修课程非常感兴趣， 来信向你询问相关事宜。请根据以下内容提示给他写封回信：