2.    I don’t know much about the games which are being played by children nowadays.

I don't know much about the games (a)   by children nowadays.

3.    A man who has a full beard is much easier to spot than one who does not have a beard.

A man (a)   is much easier to spot than one who doesn't have a beard.

4.    Mr Charles Demsey, who is the delegate from New Zealand, abstained from the final vote.

Mr Charles Demsey, (a)   from New Zealand, abstained from the final vote.

5.    The Mississippi, which is America's longest river, is deceptively fierce.

The Missisippi, (a)   , is deceptively fierce.

6.    One of the houses that overlook the park is for sale.

One of the houses (a)   the park is for sale.

7.    The protesters who were angry at the rise in income tax refused to disperse.

The protesters (a)   refused to disperse.

8.    The champion's father, who was proud of his son's achievement, hugged him lovingly.

The champion's father, (a)   his son's achievement, hugged him lovingly.

9.    The customer who owns a blue Mercedes has left the car's headlights on.

The customer (a)   has left the car's headlights on.

10. Paris, which is the capital of France, is a bustling town with grand hotels.

Paris, (a)   , is a bustling town with grand hotels.

11. They called the lawyer who lived nearby.

They called the lawyer (a)   nearby.

Goods which are on sale cannot be refunded.

Goods (a)   cannot be refunded.