Answer: B) Must / No, you needn't.
Explanation for this question is being written.
Answer: B) Mustn't
Answer: A) Must
Answer: D) Required
Answer: B) Must
Answer: B) Be
Answer: A) Mustn't
Answer: C) The action absolutely needs to happen.
Answer: D) Must not.
Answer: D) Must
Answer: C) Mustn't
Answer: B) The workers at the factory must wear protective clothing.
Answer: C) Must
Answer: A) You must wear a helmet.
Answer: B) Mustn't/ may.
Answer: B) Mustn't eat.
Answer: B) Don't have to.
Answer: A) You mustn't forget to lock the door when you leave.
Answer: D) Must celebrate.
Answer: B) Must not.
Answer: E) Modal
Answer: B) Must reach.
Answer: A) Must-shouldn't
Answer: E) Must
Answer: C) Must be tested.
Answer: B) Strong obligation.
Answer: A) V (infi).
Answer: A) It mustn't be a secret.
Answer: D) I must do my English homework.
Answer: B) You mustn't dive into the pool.
Answer: E) Obligation