You ______ wear a helmet when riding a bike., A. must, B. mustn’t, C. shouldn’t, D. should, You ______ eat too much candy. It is bad for your teeth., A. must, B. mustn’t, C. should, D. shouldn’t, Students ______ be quiet in the library., A. shouldn’t, B. must, C. mustn’t, D. should, You have a headache. You ______ take a rest., A. mustn’t, B. shouldn’t, C. should, D. mustn’t, You ______ use your phone during an exam., A. should, B. must, C. mustn’t, D. shouldn’t

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