We did an interesting project. （改为一般疑问句）

I think it will change the world. （改为否定句）

We don't know how to clone dead animals.（改为复合句)

We don't know how ________ ________ clone dead animals.

He is the same age as me. （改为同义句）

Mr Zhang would like to write an important report.（同义句）

I think she needs to go to the dentist.（改为一般疑问句）

Meimei is twelve years old. I am twelve years old, too.（同义句）

Eating too much is had for our health.（同义句）

You'd better do your homework now.（改为否定句）

The children ate up all the apples （改为被动语态）