9.2
2. Have you been waiting for me for a long?
3. What have you been doing?
4. How long have you been working there?
5. How long have you been selling computers?
9.4
2. I have been looking...
3. ...are you loking...
4. ...is teaching...
5. I have been thinking...
6. ...he is working.
7. ...she has been working...