五、用括号中所给单词的适当形式填空。
21. I only play computer games (one) a month.
22. —Is this shirt (you)?
—No, it's (he).
23. This isn't bike. is at home. (she)
24. Those aren't (we) bikes. They are (they).
25. That isn't pencil. is under my notebook. (I)

21. once
22. yours; his
23. her; Hers
24. our; theirs
25. my; Mine

21. "one"的副词形式"once"表示"一次"，"once a month"为固定搭配，意为"一个月一次"。
22. 第一空后无名词，需用名词性物主代词"yours"；第二空后无名词，需用名词性物主代词"his"。
23. 第一空后有名词"bike"，需用形容词性物主代词"her"；第二空后无名词，需用名词性物主代词"Hers"。
24. 第一空后有名词"bikes"，需用形容词性物主代词"our"；第二空后无名词，需用名词性物主代词"theirs"。
25. 第一空后有名词"pencil"，需用形容词性物主代词"my"；第二空后无名词，需用名词性物主代词"Mine"。

六、语法填空。
Mary is my friend. She is 26. English student. She is in Grade 7 now. Mary 27. (usual) gets up at 6:45 in the morning. She always 28. (have) some bread and a glass of milk for breakfast. She goes to school on foot 29. her home is near the school. She is never late for school.
The class starts at 8:00 a.m. She has four 30. (class) in the morning and two in the afternoon. At about 12:00, Mary has lunch 31. her classmates Kate and Ann at school. They hardly ever 32. (eat) junk food. After lunch, Mary often sleeps for half an hour.
School is over at 5:00 in the afternoon. Mary always 33. (get) home at about 5:10 p.m. At home, she does 34. (she) homework first. After her parents come back, Mary has dinner with 35. (they). She goes to bed at about 9:30 p.m.

26. an
27. usually
28. has
29. because
30. classes
31. with
32. eat
33. gets
34. her
35. them

26. 这里表示“她是一个英国学生”，English以元音音素开头，用不定冠词an。
27. 修饰动词gets up要用副词，usual的副词形式是usually。
28. 主语She是第三人称单数，一般现在时中动词要用第三人称单数形式，have的第三人称单数形式是has。
29. “her home is near the school”是“She goes to school on foot”的原因，所以用because。
30. four后接可数名词复数形式，class的复数是classes。
31. “have lunch with sb.”表示“和某人一起吃午餐”，用with。
32. 主语They是复数，一般现在时中动词用原形eat。
33. 主语Mary是第三人称单数，一般现在时中动词要用第三人称单数形式，get的第三人称单数形式是gets。
34. “do one's homework”表示“做某人的家庭作业”，这里用she的形容词性物主代词her。
35. with是介词，后接人称代词宾格，they的宾格是them。