Question

Today our entire class (was, are) excited about the talent show.

Is was the correct answer for the sentence?

Answer 1

class is singular...was
classes is plural....are

Our class is excited
Our classes are excited.

Answer 2

The adverb "Today" indicates that it's happening now. To use "was" indicates past tense; to use "are" indicates present tense. What do you think?

You are dealing with a collective noun here, too -- "class" -- so read this:
http://grammar.ccc.commnet.edu/grammar/plurals.htm#collective_nouns

Answer 3

was