Question

Fill in the blank with the appropriate modal that denotes an obligation:

You _____ work hard if you want to get a first class.

• A. ought to
• B. might
• C. could
• D. would

Answer 1

The correct option is A ought to

We want to give a strong advice to someone to work hard so the modal of choice will be 'ought to'; 'might', 'could' and 'would' are modals of probability or possibility.