9.2
2) Have you been waiting long?
3) What have you been doing?
4) How long have you been working there?
5) How long have you been selling mobile phones?
9.3
2) have been waiting
3) have been learning
4) She has been working...
5) They have been spending their holidays in Spain...
9.4
2) I have been looking...
3) are you looking
4) She has been teaching
5) I have thought (я обдумал) /I have been thinking(я думал) Можно и так и так.
6) he is working
7) she has been working