Поставьте глаголы в активный или пассивный залог.
1.The surgeon (to use) artificial joints.
2.Some operations (to perform) on the open heart yesterday.
3.This textbook (to be) experimental.
4.This book (to read) with great interest by all the students.
Відповідь:
used
were performed
is
is read
Пояснення: