Modal Verbs - Exercises (must, need, have to)

Exercise 1:
Fill in "mustn't or needn't
Exercise 2
Fill in "didn't have to - needn't have to"
Exercise 3
Fill in "don't have to - mustn't"
Exercise 4
Fill in "have to, must, must not"


Source: smic.be
Source: Englishclub
Source: University of Victoria