Help me please……………………

b. Should

Explanation:

"Should" is used in normative statements, or statements of opinion. The other three words indicate their is sound proof and research behind it.

Should

Explanation:

for me, balancing all your work/homework is the hardest part in high school and the exams.

comfortable

explanation:

one type of the adjectives is predicate adjective. a predicate adjective is an adjective which follows a linking verb and modifies or refers back to the main subject of that linking verb.

it usually is used just before the noun it modies.

here in this example:

'penguins seem comfortable in the coolest habitats', comfortable is the predicate adjective which follows the linking verb 'seem' and modifies the noun.