Everybody in our street know the new collection day.
Everybody in our street knows the new collection day.✓Ճիշտ պատասխան
Everybody in our street are checking the notice.
Everybody in our street have received a leaflet.
Բացատրություն
Everybody takes singular agreement, so knows is the correct present form with that subject. Know and have treat everybody as plural, while are also conflicts with the pronoun's grammatical singularity.