The boy wanted to ride his bicycle in the street, but his mother told him（）

单项选择题Half of those books（）best-sellers.

A. is
B. are
C. am
D. was

单项选择题If there were no examinations, we should have （） at school.

A. the happiest time
B. a more happier time
C. much happiest time
D. a much happier time