將下列句子改爲被動語態,並根據情況保留或去掉動作的執行者.

題目：

將下列句子改爲被動語態,並根據情況保留或去掉動作的執行者.
 

解答：

A new business are to be opened up next week
All these damage couldn't have been done by children
He will be seen off by all of us at the airport
The tigers are fed at the zoon three times a day
You homework must be handed in before five
She is said to be a good teache