3. You shouldn't delay your visit to the dentist any longer. If you wish, I can make an appointment for you.

Решение:

Нужно перефразировать предложение, используя глагол "put".

1. You shouldn't put off your visit to the dentist any longer. If you wish, I can make an appointment for you.

Ответ: You shouldn't put off your visit to the dentist any longer. If you wish, I can make an appointment for you.