The exercise aims for you to use the verb ESTAR conjugated in present indicative combined with an adjective, an often confusion when using adjectives with SER or ESTAR is about the meaning, when you use the verb SER the interpretation is that the situation is permanent, while if you use the verb ESTAR the interpretation is that the situation is temporary.
Here is the indicative conjugation of the verb ESTAR in present.
ESTAR
Presente Indicativo
yo estoy
tú estás
él/ella está
nosotros estamos
vosotros estais
ellos/ellas están
Here is a list of common adjectives used in Spanish: