บทสนทานาต่อไปนี้ใช้ตอบคำถามข้อ17-20

Somchai: Many teachers are against including sex education in biology class.
Sunee: Are they? ___17___?
Somchai: Some ask if we have noting better to teach
                Others think it's embarrassing to discuss sex with kids.
Sunee: So,no one has a positive attitude towards it.
Somchai: __18__. Tey say sex education in school will help solve the problems of
               Unwanted pregnancies and sexually transmitted diseases.
Sunee:   Really?
Somchai: ___19___ ? What do you think?
Sunee:  ____20___. k have absolutely no interest in sex education or biology.

Choose the best answer.