You _____ smoke in indoor places. (must / mustn't)
musn't.
You ______ drink a lot of coke. (Should / shouldn't)
shouldn't
You ____ do your homework. (must / mustn't)
must
We _____ eat a lot of vegetables. (should / shouldn't)
should
You _____ take a shower every day. (should / shouldn't)
Should
I ______ go alone. It's dark. (Should / shouldn't)
shouldn't
You ____ swim here. (must / mustn't)
musn't.
Look at the sign. You _____ enter. (must / mustn't)
mustn't
I feel sick. I _____ see a doctor. (should / shouldn't)
should
You ____ fasten you seat belt when driving a car. (must / mustn't)
must