Rewrite the sentences.Add which or who + the verb to be.

1.Marina D'Or, famous for its sea-water spa,is one of the biggest holiday complexes in Europe.

Marina D'Or, which is famous for its sea-water spa, is one of the biggest holiday complexes in Europe.

2.MP3 players, designed to be the modern-day Walkman, are really popular.

MP3 players, which are designed to be the modern-day Walkman, are really popular.

3.Television, invented in the 1920s, really changed the way people viewed the world.

Television, which was invented in the 1920s, really changed the way people viewed the world.

4.Muhammad Ali, once the best boxer in the world, has been a peace ambassadoe for the UN.

Muhammad Ali, who once was the best boxer in the world, has been a peace ambassador.

Is this right?