to observe or inspect carefully or critically
to interrogate
to determine the aptitude, skills or qualifications of someone by subjecting them to an examination
to check the health or condition of something or someone
To notice or view, especially carefully or with attention to detail.
To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning).
To comment on something; to make an observation.
To follow or obey the custom, practice, or rules (especially of a religion).