Question: There was an expression of exultation on his face which I could not understand.
I didn't understand his expression.

Answer: yes

Question: Well, good-bye.
The young man said goodbye as he rode off into the sunset, never to return home.

Answer: it is not possible to tell

Question: The changed data must also be reviewed by and approved by an authorized official.
The data can be amended freely after it is approved.

Answer:
no