第137页 - 译林版七年级（初一）英语学习与评价答案（上下册）

 On 20 September.

 Twenty/20.

 To make our teeth cleaner.

 Every three months.

 I brush them twice a day. / I don't eat too much candy.

C

D

B

A

1. history 2. celebrate 3. begin 4. different 5. other 6. Usually 7. interesting 8. answers 9. shows 10. dance