Вставьте в правильной форме местоимение:

1. Don't take ... (my; mine) pen! Take ... (your; yours)

2. What was ... (your;yours) mother doing?

3. ..... Farm is as rich as ... (our;ours;their;theirs)

4. This office is ... (their; theirs)

5.Those are Victor's books. The book are ... (mine;his;hers) 

1. Don't take my  pen! Take  yours

2. What was your mother doing?

3. Our farm is as rich as theirs

4. This office is theirs

5.Those are Victor's books. The books are his 

1. Don't take my pen! Take yours.

2. What was your mother doing?

3. Our farm is as rich as theirs.

4. This office is theirs.

5.Those are Victor's books. The books are his. (скорее всего допущена ошибка при переписывании. the books - правильный вариант)