Must/ mustn't, / should / shouldn't
1. The students ... wear school uniform
2. You ... forget your passport when you travel to another country
3. If you feel bad you ... visit a doctor
4. You ... talk in the library.
5. We be so careless about nature​

Ответ:

1. The students must wear school uniform.

2. You mustn't forget your pasport when you travel to another country.

3. If you fell bad you should visit a doctor.

4. You mustn't talk in the library (Тут лучше mustn't, но можно и shouldn't)

5. We must be so careless about nature

Объяснение:

Всё правильно, мона лучший ответ?)