THIS IS A NON-SMOKING ROOM. YOU……SMOKE IN HERE .( NEED/ NEEDN’T / M...

4. - ON TAP KIEM TRA 1 TIET SO 2
ON TAP KIEM TRA 1 TIET SO 2

4. This is a non-smoking room. You……smoke in here .( need/ needn’t / must / mustn’t )