Помогите разобраться с предложениями. Модуль (Module) 1b № 6. ГДЗ Английский язык Spotlight 9 класс Ваулина.

Read the sentences (1-4). Which: express worry? express concern? reassure?
 
1      Oh, no, I can’t believe it.
2      What’s the matter?
3      Try not to worry too much.
4      I’m really worried about it.
The sentences have been taken from a dialogue between two friends. What’s the dialogue about? Listen and read to check.