The old man was very happy.Because he_____(迫不及待) see his grandson 痕线上怎么填

The old man was very happy.Because he_____(迫不及待) see his grandson 痕线上怎么填
The old man was very happy.Because he_____(迫不及待) see his grandson 痕线上怎么填

The old man was very happy.Because he_____(迫不及待) see his grandson 痕线上怎么填
The old man was very happy.Because he (couldn't wait to 迫不及待) see his grandson
加油!不明白再问!

cannot wait to

填couldn't wait to, can't wait to do sth.是固定句式，迫不及待做某事的意思。请指教！