1,They like graffes.改为否定句
2,Let's go for a walk.改为同义句
3,She likes penguins.Penguins are smart.合并为一句
4,He likes to （see the lions）..对括号部分提问
5,I (want to see the dolphins),because they are interesting.对括号部分提问
6,Tigers are （my favorite animals)..对括号部分提问
7,She likes pandas best.改为一般疑问句