四、用括号中所给单词的适当形式填空。
27. The sun is much (big) than the earth.
28. —I heard you got sick yesterday. Are you feeling much (well) today?
—No, I feel even (bad).
29. The West Lake is very , but the East Lake is even . (large)
30. Sleeping (little) than eight hours may make you feel tired during the day.
31. Martin is than me. I want to be as as him. (tall)

27. bigger
28. better; worse
29. large; larger
30. less
31. taller; tall

本题考查人教版八年级上册Unit3核心的形容词比较级相关语法点：1. 句中出现than、much、even这类常修饰比较级的标志词时，要使用对应形容词/副词的比较级形式；2. very修饰形容词原级，as...as的同级比较结构中间必须使用形容词原级。
27. 句中有than，much修饰比较级，big是重读闭音节单词，双写末尾辅音g加er变为比较级bigger。
28. 第一空much修饰比较级，well指代身体状态好时，比较级为better；第二空even修饰比较级，bad的比较级为worse。
29. 第一空very后接形容词原级，填large；第二空even修饰比较级，large的比较级为larger。
30. 句中有than，little的比较级为less，less than是固定搭配，意为“少于”。
31. 第一空后有than，tall的比较级为taller；第二空是as+形容词原级+as的同级比较结构，填原级tall。

五、用方框中所给单词的适当形式填空。每词限用一次。
serious long early quietly easy friendly
32. Kate gets up than John.
33. Miss Li is not as as Mr Wang. She often tells funny stories in her class.
34. The Yangtze River is than the Yellow River.
35. WeChat makes our life than before.
36. Jenny spoke than other speakers, so we could hardly hear her.
37. Jim is than Tom, so he has more friends than Tom.

32. earlier
33. serious
34. longer
35. easier
36. more quietly
37. friendlier/more friendly

本题主要考查形容词、副词的比较级用法以及"as+形容词原级+as"的同级比较固定结构，结合语境和所给单词变形即可，每词限用一次：
32. 句中出现than表两者对比，修饰动词短语gets up，early的比较级为earlier，符合“凯特比约翰起得更早”的语境。
33. "not as+形容词原级+as"意为“不如……”，根据后句“她经常在课上讲有趣的故事”，可知李老师不如王老师严肃，直接填形容词原级serious。
34. 由than可知要用形容词比较级，结合常识长江比黄河长，long的比较级是longer。
35. 句中than提示用比较级，语境为微信让我们的生活比以前更便利，easy的比较级是easier。
36. 修饰动词spoke，than提示用副词比较级，根据后句“我们几乎听不到她的声音”，可知珍妮比其他发言者说话声音更轻，quietly的比较级是more quietly。
37. 由than可知用形容词比较级，根据后句“他的朋友比汤姆多”，可知吉姆比汤姆更友好，friendly的比较级为friendlier/more friendly。

六、语法填空。
Let me introduce myself and my sister Liu Ying to you.
We both have black hair, though my hair is 38. (short) than hers.
She is 39. (slim) than me. We both like sports. She plays volleyball 40. (well) than me, so she often wins when we play together. But I run 41. (fast) than her. She is much 42. (outgoing). And I’m 43. (quiet) than her. She is much 44. (nice) too and always helps others. I think I’m 45. (smart) than her. I often get 46. (good) grades. But my mother often says she is 47. (hard-working) than me. Besides, we both enjoy going to parties.

38. shorter
39. slimmer
40. better
41. faster
42. more outgoing
43. quieter
44. nicer
45. smarter
46. better
47. more hard-working

本题考查人教版八年级上册Unit3的形容词、副词比较级用法：描述两者之间的对比时，需使用形容词/副词的比较级，常见标志词为than；程度副词much也可用来修饰比较级，表“……得多”以加强比较程度。本题所有空格均是描述我和妹妹两人的特征对比，将括号内的词转换为对应正确的比较级形式即可。