They (must/should/shouldn't) put on a bandage over those deep cuts. It's bleeding a lot!
must
If you have a temperature, you (should/must/mustn't) lie down and rest.
should
The kids are sick. Should they go swimming?
No, they shouldn't.
Mark has broken his leg. Should he move it?
No, he shouldn't.
If she has a headache, she (shouldn't/should/must) take a cough drop - an aspirin is better.
shouldn't
If you have a broken arm or leg, this first thing you (should/must/shouldn't) do is go to a doctor.
must
People (shouldn't/should/mustn't) cover their mouths when they cough.
should
When you have a sore throat, you (mustn't/must/should) take some cough drops.
should
We (shouldn't/should/mustn't) use the phone during the class to talk to our friends.
mustn't
My friend had a big stomachache yesterday, and now he (shouldn't/should/must) eat a lot of sugar.
shouldn't
If you have a snake bite, you (must/should/shouldn't) go to the doctor.
must
What must I do if I have COVID-19 symptoms?
You must go to the doctor. / You must call your doctor. (other answers?)
If you want to play a guitar, you (must/shouldn't/should) take lessons at Music school.
should
Where should I go if I have a temperature and a headache?
You should go to the hospital. / You should stay home. (other answers?)
With the COVID-19 pandemic happening, we (mustn't/must/should) wear masks and sanitize all the time.
must
Students (must/should/shouldn't) wear a uniform when they go to school.
must