What is the number 100 in German

Choose the best pronoun to complete this sentence: der nachtisch ist lecker. ich esse •es •sie•er •ihn

When you use construct a sentence in german in past tense for example i drank milk on monday in the caravan the last tense version ich getrinken milsch am montag in mine whonwagen how would you put this is the write order if the sentence

Choose a logical response: welcher tag ist heute? schreiben gern samstag laufen (dont answer for you aren't sure)