Everyone are expected (1)/ to come (2)/ to school tomorrow. (3)/ No error (4)

Answer

1

Explanation

is will replace are because -
A Singular Verb Is used after everyone or every- body
Look at the examples given below:
Everyone `underset("Singular Verb (With s)")underset(darr)("wants")` to find out what is going on.
Everybody `underset("Singular Verb")underset(darr)("is")` selling the same product.
Hence, Everyone is expected Is the right usage