Modals of obligation exercises multiple choice - Verb exercises

Choose the most suitable modal verb to complete the sentences.
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It 's a good example of something we _____ not repeat, an example we need to avoid.
should
ought
must
Normalization _____ not be viewed as a one-sided gesture.
ought
must
should
They _____ never be preserved and / or packed for later consumption.
ought
should
must
For example, all draft resolutions _____ be discussed in depth before being submitted for the approval of members.
must
should
ought
The Democratic People 's Republic of Korea _____ take concrete steps to advance normalization talks.
ought
should
must
You _____ to get this book if you want to lose weight long term and sustainable.
ought
must
should
It _____ fit closely, but comfortably, with space to put a finger underneath it.
should
ought
must
Scotty, I think we _____ to lock the doors.
must
should
ought
The unit _____ never be left unsupervised while the motor is running.
must
ought
should
Somebody _____ have cut the power remotely.
must
ought
should