Ответ:
1) Rob asked Bob if he liked coffee.
2) Tom asked Olga if she had been at the disco the previous day.
3) Misha asked Mary if she had been working in the garden for 2 hours.
4) Ted asked Tom if he had been playing those computer games between 4 and 6 the day before.
5) Jane asked Nick when he would fly to London.
6) Dick asked Jane how long she had been watching TV.
7) Bob asked Dick who was playing tennis at the moment.
8) Ann asked Gary what she had cooked by 1 o'clock.