1. The girl who wanted to go home had flown to Japan.
2. I couldn't find the car which was under repair.
3. After all passengers alighted from the bus/car, the driver sent the bus/car to the workshop.
巴士 (bus)或汽车 (car) ?
4. When the thief entered the room, [the owner] was watching television.
小偷 (thief) 或 业主 (owner) ?