Question

modals :you......keep your promise.

Answer 1

You must keep your promise.
this is the right answer
hope it helps you

Answer 2

You should keep your promise.

• We were supposed to fill in the given blank with the help of the correct modal.
• Let us first understand the meaning of modals.
• Modals can be defined as those words which are referred to as auxiliary verbs since they behave as a possibility, intent, or necessity.
• Some of the examples of modals are: can, may, used to, ought to, must, shall, etc.
• Here, "should" will be the correct option since we want to show the necessity of something.