Hm... Ja bym to zrobiła w ten sposób:
1. John is goin on holiday to Ibiza, which is one of the Balearic Islands.
2. This is the shop where you can buy cheap clothes.
3. Where's the milk which was in the fridge?
5. Bob, who is my neighbour, is a vet.
6. I met a woman, whose son knows you.
No i czwórka, o której nie jestem przekonana:
4. Nine of skirts which she tried on, fitted her. LUB She tried on five skirts, nine of which fitted her.
Btw - zakładam że ona miała przymierzyć 9 spódnic z których 5 pasowało a nie na odwrót :P