"Should" or "would have to"

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Your children  play in the street at night.
I thought they
 pay a deposit but they were not asked to.
Tell me what I
 say to convince him.
I didn't know I
 share this flat with a madman.
I know that I
 not share a flat with a madman.