You __________ throw your trash on the floor. It isn't good for the environment!
shouldn't
You __________ go into the forest right now, it's dangerous!
shouldn't
We _________ have sushi or pizza for dinner. What do you think?
could
You ________ save some of your allowance. It's a good idea!
should
You ________ play Roblox or Minecraft.
could
You __________ ask your teacher for help if you don't understand.
should