Вставить пропущенные слова. Задание номер 2​

1
A subject - subjects; a laboratory - laboratories; a class - classes; a book - books; a dictionary - dictionaries; a translation - translations; a tape-recorder - tape-recorders; a lesson - lessons; a shelf - shelves; a child - children; a grownup - grownups; a film-strip - film-strips; a school  - schools; an institute - institutes; a teacher - teachers; a report - reports; a college - colleges; a mark - marks; a circle - circles; a story - stories; an examination - examinations.
2
Languages, representative, professions
Text, examples, rule, questions
Questions
Books
Character
Formations, tenses, voice
Passage
Songs
3
Marks, subjects
Examinations
Subject
4
Grown-ups, children
Schoolmates, teachers
Books
Books
Students.