You (weren’t supposed to / didn’t need to / mustn’t) __________________________________ (start) the exam paper when you did. That’s why the teacher looked annoyed.
weren’t supposed to start
20
Rita (must / can / may) __________________________________ (tell) Andy she doesn’t want to go out with him anymore. Otherwise, he wouldn’t be looking so upset.
must have told
15
The park was open all day, so we (needn’t / shouldn’t / didn’t need to) __________________________________ (go) home until we felt like it.
didn’t need to go
20
The head teacher (ought to / have to / need to) __________________________________ (inform) the students that the open day had been cancelled before the weekend. Some students had already arranged to come, which was a waste of time.