1.Scientists have already made robots walk and dance.（变为否定句）

1.Scientists have already made robots walk and dance.（变为否定句）
Scientists ______ _____ robots walk and dance ______.
2.There are many famous predictions.The predictions never came true.(合并为一句）
There are many famous predictions _______ never ______ ______.
谢谢——痛哭流涕——鞠躬