Что поставить?It's a/an blue school bag.
Betty are/is 14 years old.
Mark and Ann are/is in the same Science class.
The eraser/erasers are in her pencil case.
This is an/a orange.
John 'm/'s new to the school

Betty is Mark and Ann are The erasers are This is an orange Jon"s new

It's a blue school bag.Betty is 14 years old.Mark and Ann are in the same Science class.The erasers are in her pencil case.This is an orange.John's new to the school.