Составить предложение:teacher, reading, their, is, a book

Their teacher is reading a book.

Их учитель читает книгу.

Is their teacher reading a book?

Is their teacher reading a book or a magazine?

What is their teacher doing?

What is their teacher reading?

Whose teacher is reading a book?

Who is reading a book?

Their teacher is reading a book, isn\'t he?