Add commas to make non-defining relative clauses.

1 Last Christmas when we were on holiday

wh

it snowed twice.

2 My sister, who loves cooking, showed me how to

make pizza.

3 Spain where we go most summers/is one of my

favourite places.

4 Social networks/which are becoming more and

more popular, can be a good way to stay in touch.

5 My friend, whose brother is friends with my brother,

lives near me.