Should or shouldn't is a modal verb that expresses advice, that is to say what is the right thing to do
A) You __shouldn't _ smoke in bed.
B)You___should_____ go to the opera in London. It's great.
C) You __shouldn't _____tell her about it. It's too depressing.
D) You___shouldn't ____ cross the street at red traffic lights.
E) The doctor told him that he __should_eat less. He's too fat.
F) I think you ___should___spend less money on clothes. They're too expensive.
G) That's a fantastic book. You____should___ read it.
H) He is often late to work. You__should______get up earlier.
I) She___shouldn't _____ tell lies.
J) He's fifteen. He __shouldn't ______ drive car.