Сделайте в Passive Voice: 1) The teacher explained this rule twice

1) The teacher explained this rule twice. - This rule was explained by the teacher twice.

2) They do not grow fruit in this part of this country. - Fruit are not grown by them in this part of this country.

3) They have designed new scenery for the party. - New scenery for the party have been designed by them.

4) They laughed at her because of her hat. -  She was laughed at because of her hat.

5) We have already sent for the doctor. - The doctor has already been sent for by us.