That movie is really exciting. I think you'll like it. You_____ it. (should see / must see / have to see / has to see)
should see
According to Frank's doctor, he is very heavy. He ______ on a diet. (must be go / must goes / must going / must go)
must go
Excuse me. This is a no smoking area. You______ here. (don't have to smoke / must not smoke / doesn't have to smoke / don't smoke)
must not smoke