用must或mustn‘t填空
You（ ） goswimming with your parent.
You （ ） wear shoes to go into the swimming pool
You （ ） swim when you are sick
You （ ）do warm up exercies before you swim.
You （ ）must swim in a swimming suit
You （ ） take a bath before you go into swimming pool.
You（ ）put rubbish in the pool.
You （ ） cry for help and raise your hand when you are in difficulty .the life guide will come.
You （ ） put cameras mp3 or mobile phones near the pool.
You （ ） go swiwwing when there is a thunderstorm.