Answer: A) Must
Explanation for this question is being written.
Answer: B) Mustn't
Answer: B) MUST
Answer: A) MUST
Answer: D) Shall be submitted. Changes to the flight plan have to be reported.
Answer: B) Not bound to return.
Answer: A) You must follow the rules.
Answer: C) Mustn't
Answer: A) Readers mustn't take books out of the library without first filling in a form.
Answer: D) Must
Answer: B) Mustn't want.
Answer: B) Must
Answer: A) Obligation and necessity.
Answer: C) Must
Answer: A) Mustn't
Answer: B) Modal verb.
Answer: A) They must neither run nor shout in the playground.
Answer: B) Must study.
Answer: B) Obligation
Answer: A) We mustn't run in the corridors.
Answer: B) The speaker.
Answer: A) Must be reviewed.
Answer: D) Don't have to.
Answer: A) Halt
Answer: B) Have to.
Answer: C) No, you must not use camera here.
Answer: A) Must not.
Answer: B) Must not.