To conceal his true activities, the spy quickly a plausible excuse for his presence there.

fabricated

Explanation:

Disguise would make sense but that is what he is doing. He is fabricating an explanation because fabricate means to “come up with” or create.

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.

sorry but whats the question?