You...........study harder if you want to pass the exam., would, can, may, should, She ..........play the piano very well when she was a child., can, should, could, must, If I had money, I ............ travel around the world., must, would, will, shall, You ..........wear a helmet when you ride a bike. Its the law ., must, can, may, could, ........... we go to the park this afternoon?, could, shall, would, must

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