8.Let's go to the cinema together. - I'm sorry, I ... a) Must
b) Can't
c) Mustn't
надо выбрать ​

Must

Объяснение:

Я не знаю как объяснит, но по моему Must

to be afraid ,to be hungry,to be busy,to be tired,to be cheerful,to quiet,to be kind,to be lucky

  to   go for a walk,to sit ,to stand,to read,to run ,to jump,to see , to drink,to write ,to think,

1)who was at the zoo?

2) they were at school