[ Must / must not ]
You… obey the traffic rules.
A. must
B. mustn’t

Random Topics:
SubjunctivesSingular and Plural NounsFuture - Will and Be going toPast ModalsPresent Continuous for FutureSecond and Third ConditionalPossessive PronounsPersonal PronounClauses of ReasonDirect-Indirect SpeechOther quiz:
Modal Verbs and Conditionals › ViewIs used in dealing with things impossible in the present and are unlikely to occur in the future. It is formed using this structure: condition – if + past simple; main clause – would + infinitive.
A. Zero
B. First
C. Second
D. Third
Grammar › View
Grant _____ be feeling stressed about his exams but perhaps not. He usually gets good grades.
A. must
B. can
C. could
Tenses › ViewIt was getting late and Eric LeMarque decided to have one final run on his snowboard. As he … down the mountain, he came across a thick fog and headed in the wrong direction.
A. ‘d gone
B. was going
Grammar › View
All of the ______ in our choir have come down with laryngitis.
A. altos
B. altoes