[ Expressing Obligation and Modals ]
A good sense of humour is important, even in business. You ____________ serious all the time.
A. don’t got to be
B. don’t have to be
C. mustn’t be
D. don’t not have to be

Random Topics:
Grammar - Present Perfect with for and sinceSimple, Compound, Complex SentencesPrepositions and ConjunctionsBare Infinitive and To InfinitiveGrammar - PunctuationPresent/Past/Past ParticpleCompliment, Congratulation, and HopePast Simple (to be)3rd Person SingularIN, ON & ATOther quiz:
Adverbial Clause, Noun Clause › View____________ hard she worked, she did not pass the exam.
A. Whatever
B. Whenever
C. However
D. Whoever
Gerunds and Infitinitives › View
I was really surprised ______ that Lucy and Adam have separated. I thought that they were very happy. (hear)
A. to hear
B. hearing
Irregular Verbs › ViewWhat’s that smell? You didn’t ______________ the sausages, did you?
A. burnt
B. burned
C. burn
Grammar › View
It is good offer but I am not sure whether I should ___________ it.
A. accept
B. acept
C. accetp
D. eccept
