2) A necklace is a piece of jewellery[b] which [/b]you wear around your [b]neck.[/b]
3) A gym is a place [b]where[/b] you do [b]exercise[/b].
4) A coat is something [b]which[/b] keeps you [b]warm[/b].
5) A mechanic is someone [b]who[/b] fixes [b]cars[/b].