OUGHT TO and SHOULD are interchangeable in three of the four sentences below. Whichis 36.the only alternative, form a to d, that corresponds better to your choice?

I. You should/ought to see “Daughter of the moon” – it’s a great film.
II. You should/ought to move your head a bit.
III. I’ve bought three loaves – that should/ought to be enough.
IV. That should/ought to be Janet coming upstairs now.

The only correct affirmatives are