Answer: B) I must congratulate you.
Explanation for this question is being written.
Answer: C) Mustn't
Answer: C) Must
Answer: B) Every student must write an essay on music.
Answer: A) Must
Answer: A) Must not.
Answer: A) Mustn't
Answer: A) Have to.
Answer: D) Mustn't
Answer: B) Must
Answer: B) Mustn't
Answer: A) All the students must hand in their assignments on time.
Answer: B) You mustn't use products made from rhinoceros horn.
Answer: A) Mustn't they.
Answer: C) It is not compulsory.
Answer: B) You must come early.
Answer: A) Strong prohibition.
Answer: B) Needn't
Answer: A) NECESSITY
Answer: C) Must not.
Answer: B) Must not.
Answer: A) You mustn't be late for class.
Answer: A) Must; mustn't.
Answer: B) Must not touch / may be.
Answer: B) Work