1.These books are on the wrong shelf. They shouldn't/ mustn't be here.
2.There is plenty of time. We mustn't/ don't have to be at the cinema until 8.00.
3.Please put the paper cups and plates in the bin. We mustn't/ don't have to leave the room in a mess.
4.Thanks for coming. I'm glad you can/ could make it.
5.You look really tired. You should/ might take a few days off and have a holiday.