A: you must/mustn t put your hand up to ask a question b: what s the matter, officer ? you must/mustn t park your car here c: you must/mustn t do any sports d: you must/mustn tbuy a ticket before

A. You must put your hand up to ask a question
B. What s the matter, officer? You musn't park your car here
C: You must do any sports
D: You must buy a ticket before