English pronouns exercise

Are you talking to ? ( I )
Don’t ask . doesn’t know. ( she / she )
Don’t ask . Ask . ( I / he )
Hasn’t arrived yet? ( she )
don’t understand. ( I )
Nobody told the train was leaving. ( they )
phoned yesterday. ( she )
This is Susan. have known for years. ( we / she )
We watched for hours. ( he )
Why didn’t ask to come? ( she / they )